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Introduction
1. Reaction of acetaldehyde with HCN followed by
hydrolysis gives a compound which shows [MP PET 1997]
(a) Optical isomerism (b) Geometrical
isomerism
(c) Metamerism (d) Tautomerism
2. In aldehydes and ketones, carbon of carbonyl
group is
[MP PMT 1995; RPET 1999, 2000]
(a)
3
sp hybridised (b)
2
sp hybridised
(c) sp hybridised (d) Unhybridised
3. The IUPAC name of the following structure is
CH O
CH CH C CH CHOH
3
| ||
3 2 2
[MP PMT 1995]
(a) 1 - hydroxy 4-methyl 3-pentanone
(b) 2 - methyl 5-hydroxy 3-pentanone
(c) 4 - methyl 3- oxo 1 - pentanol
(d) Hexanol-1, one- 3
4. Glyoxal is [BVP 2003]
(a) CH O CHO
2 2
(b)
CHOH
CHOH
2
|
2
(c)
CHO
CHO
|
(d)
CHO
CHOH
|
2
5. Aldehydes are isomeric with
(a) Ketones (b) Ethers
(c) Alcohols (d) Fatty acids
6. Which of the following compounds does not
contain an OH group [CPMT 1982]
(a) Phenol (b) Carboxylic acid
(c) Aldehydes (d) Alcohols
7. IUPAC name of 3 3
CHCOCH is [MP PET 1991]
(a) Acetone (b) 2 - propanone
(c) Dimethyl ketone (d) Propanal
8. What is the compound called if remaining two
valencies of a carbonyl group are satisfied by two
alkyl groups
[CPMT 1990]
(a) Aldehyde (b) Ketone
(c) Acid (d) Acid chloride
9. CN
OH
H
CH C
|
|
3
is
(a) Acetaldehyde cyanohydrin
(b) Acetone cyanohydrin
(c) Cyanoethanol
(d) Ethanol nitrile
10. Ethanedial has which functional group(s)
(a) One ketonic (b) Two aldehydic
(c) One double bond (d) Two double bond
11. In the group C O
R
R
the carbonyl carbon is
joined to other atoms by
(a) Two sigma and one pi bonds
(b) Three sigma and one pi bonds
(c) One sigma and two pi bonds
(d) Two sigma and two pi bonds
12. Which of the following types of isomerism is
shown by pentanone [MP PMT 1995]
(a) Chain isomerism (b) Position isomerism
(c) Functional isomerism (d) All of these
13. IUPAC name of CClCHO
3
is [MP PMT/PET 1988]
(a) Chloral (b) Trichloro
acetaldehyde
(c) 1, 1, 1-trichloroethanal (d)2, 2, 2-trichloroethanal
14. Which of the following is a mixed ketone [AFMC 1997]
(a) Pentanone (b) Acetophenone
(c) Benzophenone (d) Butanone
15. Chloral is [CPMT 1976, 84]
(a) CClCHO
3
(b)
3 3
CClCOCH
(c)
3 3
CClCOCCl (d) CCl CHOH
3 2
16. Carbonyl compounds are usually
(a) Ethers, aldehydes, ketones and carboxylic
acids
(b) Aldehydes, ketones and carboxylic acids
(c) Aldehydes and ketones
(d) Carboxylic acids
17. Acetone and acetaldehyde are [KCET 1998]
(a) Position isomers (b) Functional isomers
(c) Not isomers (d) Chain isomers
18. Which of the aldehyde is most reactive? [DCE 2004]
(a) C H CHO
6 5
(b) CHCHO
3
(c) HCHO (d) All the equally
reactive
Preparation
1. The end product in the following sequence of
reaction is
[]
20 %
1%HgSO 3
2 4
4
CHMgX O
H SO
HC CH A B
[Bihar CEE 2002]
(a) Acetic acid (b) Isopropyl alcohol
(c) Acetone (d) Ethanol
2. In the following reaction, product P is Cl
O
R C
||
P
Pd BaSO
H
4
2
[CBSE PMT 1991, 2000, 02; Kerala CET 2001;
IIT 1992; AIIMS 1997; AFMC 1998]
(a) RCH OH
2
(b) RCOOH
(c) RCHO (d)
3
RCH
3. Acetophenone is prepared from [CPMT 2003]
(a) Rosenmund reaction
(b) Sandmayer reaction
(c) Wurtz reaction
(d) Friedel craft reaction
4. Compound which gives acetone on ozonolysis
[UPSEAT 2003]
(a)
3 3
CH CH CH CH (b)
3 2 32
( CH ) C C ( CH )
(c)
6 5 2
C HCH CH (d)
3 2
CH CH CH
2
2 2 5
||
3
A
HO
NaOH
CH COOCH
O
CH C
product ‘ A ’ in the reaction is [RPMT 2003]
(a) CHCOOH
3
(b) C HOH
2 5
(c)
3 3
CHCOCH (d) C HCHO
2 5
6. Which one of the following compounds is
prepared in the laboratory from benzene by a
substitution reaction
[EAMCET 2003]
(a) Glyoxal (b) Cyclohexane
(c) Acetophenone (d) Hexabromo
cyclohexane
7. Ketones ( )
1
||
R
O
R C
where
1
R R
alkyl group. It
can be obtained in one step by [CBSE PMT 1997]
(a) Hydrolysis of esters
(b) Oxidation of primary alcohol
(c) Oxidation of secondary alcohol
(d) Reaction of acid halide with alcohols
8. Predict the product ‘ B ’ in the sequence of reaction
HC CH A B
NaOH
HgSO
H SO
4
2 4
30 %
[CBSE PMT 2001]
(a) CHCOONa
3
(b) CHCOOH
3
(c) CH CHO
3
(d) CHCHO
OH
CH CH
2
|
3
3
/
2
3
4
CH COCl CHCHO HCl
PdBaSO
H
The above reaction is called [JIPMER 1997]
(a) Reimer-Tiemann reaction (b) Cannizzaro reaction
(c) Rosenmund reaction (d) Reformatsky reaction
10. The oxidation of toluene to benzaldehyde by
chromyl chloride is called
[CBSE PMT 1996; AFMC 1998, 99; AIIMS 2000;
JIPMER 2001; AFMC 2001; DCE 2004]
(a) Cannizzaro reaction (b) Wurtz reaction
(c) Etard reaction (d) Reimer-Tiemann
reaction
11. From which of the following tertiary butyl alcohol
is obtained by the action of methyl magnesium
iodide
[MP CET 2000]
(a) HCHO (b) CH CHO
3
(c)
3 3
CHCOCH
(d)
2
CO
12. Catalyst used in Rosenmund reduction is [Bihar MEE 1997]
(a) Pd /
4
BaSO (b) Zn - Hg couple
(c)
4
LiAlH (d)
2
Ni / H
HO
R
CH CH C CH
2
3 2
Butanone, R is [BHU 2003]
(a)
Hg (b)
4
KMnO
(c)
3
KClO (d)
2 2 7
KCrO
14. Dry heating of calcium acetate gives
[DPMT 1979, 81, 96; NCERT 1981; KCET 1993;
Bihar CEE 1995; MNR 1986; MP PMT 1997;
MP PET 1993, 95; JIPMER 2002; AIIMS 1996;
CPMT 1982, 86, 96, 2003; RPMT 2002]
(a) Acetaldehyde (b) Ethane
(c) Acetic acid (d) Acetone
15. Identify the product C in the series
CH CN A B C
Na CHOH HNO
/ Tollen'sreagent
3
25 2
[MP PET 1999]
(a) CH COOH
3
(b) CH CH NHOH
3 2
(c)
3 2
CHCONH (d) CH CHO
3
16. Acetophenone is prepared by the reaction of
which of the following in the presence of
3
AlCl
catalyst [AIIMS 1996]
(a) Phenol and acetic acid
(b) Benzene and acetone
(c) Benzene and acetyl chloride
(d) Phenol and acetone
17. Isopropyl alcohol on oxidation gives
[RPMT 1997; BHU 1997]
(a) Acetone (b) Acetaldehyde
(c) Ether (d) Ethylene
18. On heating calcium acetate and calcium formate,
the product formed is
[DPMT 1984; EAMCET 1985; MP PMT 1996, 92;
KCET 1990; CPMT 1979, 82, 84; BIT 1992; RPET 2000]
(a)
3 3
CHCOCH
(b) CHCHO
3
(c)
3
HCHO CaCO (d)
3 3
CH CHO CaCO
19. Which of the following compound gives a ketone
with Grignard reagent [CPMT 1988; MP PET 1997]
(a) Formaldehyde (b) Ethyl alcohol
(c) Methyl cyanide (d) Methyl iodide
20. In the Rosenmund's reduction,
4
BaSO taken with
catalyst Pd acts as
(a) Promotor (b) Catalytic poison
(c) Cooperator (d) Absorber
42. On reductive ozonolysis yields
[Orissa JEE 2005]
(a) 6 - oxoheptanal (b) 6 - oxoheptanoic acid
(c) 6 - hydroxyheptanal (d) 3 - hydroxypentanal
43. An alkene of molecular formula
9 18
CH
on
ozonolysis gives 2,2 dimethyl propanal & 2 -
butanon, then the alkene is
[Kerala CET 2005]
(a) 2, 2, 4-trimethyl – 3 - hexene
(b) 2, 2, 6-trimethyl- 3 - hexene
(c) 2, 3, 4-trimethyl- 2 - hexene
(d) 2, 2, 4-trimethyl- 2 - hexene
(e) 2, 2dimethyl- 2 - heptene
Properties
1. Identify the reactant X and the product Y
CH CO CH X CH C OMg Cl
3 3 33
Y Mg ( OH ) Cl
[Kerala PMT 2003]
(a)
2 3 2
X MgCl ; Y CHCH CH
(b)
3 2 5 3
X CHMgCl ; Y CHCOCH
(c) X CHMgClY CH C OH
3 33
(d) X CHMgClY CH C OH
2 5 33
2. When m - chlorobenzaldehyde is treated with 50%
KOH solution, the product ( s ) obtained is (are)
[CBSE PMT 2003]
(a)
(b)
(c)
(d)
3. A and B in the following reactions are
2 2
|| CH NH
OH
C
R
R
R A
O
R C
B
KCN
HCN
[CBSE PMT 2003]
(a)
4
' , B LiAlH
OH
CN
A RRC
(b)
3
' , B NH
COOH
OH
A RRC
(c)
B HO
OH
CN
A RRC
3
(d) A RR ' CHCN , B NaOH
2
4. Reduction of Aldehydes and Ketones to
hydrocarbon take place in the presence of [CPMT 2003]
(a) Zn amalgam and HCl acid
(b)
4
Pd / BaSO
(c) Anhydrous
3
AlCl
(d) Ni / Pt
5. Reduction of C O
to
2
CH
can be carried out
with
[DCE 2000]
(a) Catalytic reduction (b) Na CHOH
2 5
(c) Wolf-Kischner reduction (d)
4
LiAlH
6. For C HCHO
6 5
which of the following is incorrect
[CPMT 1985]
(a) On oxidation it yields benzoic acid
(b) It is used in perfumery
(c) It is an aromatic aldehyde
(d) On reduction yields phenol
7. Grignard reagent on reaction with acetone forms
[BHU 1995; RPMT 2002; Roorkee 1990]
(a) Tertiary alcohol (b) Secondary alcohol
(c) Acetic acid (d) Acetaldehyde
8. Which of the following is incorrect [CBSE PMT 2001]
(a)
3
FeCl is used in the detection of phenols
(b) Fehling solution is used in the detection of
glucose
(c) Tollen’s reagent is used in detection of
unsaturation
(d)
3
NaHSO is used in the detection of carbonyl
compounds
9. Consider the following statement Acetophenone
can be prepared by
(1) Oxidation of 1-phenylethanol
(2) Reaction of benzalthanol with methyl
magnesium bromide
(3) Friedel craft’s reaction of benzene with acetyl
chloride
(4) Distillation of calcium benzoate [SCRA 2001]
(a) 1 and 2 (b) 1 and 4
(c) 1 and 3 (d) 3 and 4
10. Which one of the following pairs is not correctly
matched
Hydrolysis
OH
COO
OH
CH OH
2
COO
Cl
CH OH
2
Cl
Cl Cl
OH OH
CH – CH
OH OH
OH OH
CH – CH
[SCRA 2001]
(a)
2
Clemenson' sreduction
C O CH
(b) C O CHOH
Wolf-Kishnerreduction
(c) COCl CHO
Rosenmund'sreduction
(d) C N CHO
Stephenreduction
11. Which of the following gives aldol condensation
reaction
[CPMT 2001]
(a) C HOH
6 5
(b)
6 5
||
6 5
CH
O
C H C
(c)
3
||
3 2
CH
O
CH CH C (d)
3
||
3 3
( ) CH
O
CH C C
12. Which of the following products is formed when
benzaldehyde is treated with CHMgBr
3
and the
addition product so obtained is subjected to acid
hydrolysis
[Haryana CEET 2000]
(a) Secondary alcohol (b) A primary alcohol
(c) Phenol (d) Tert-Butyl alcohol
13. Aldol condensation will not be observed in [GATE 2001]
(a) Chloral (b) Phenyl acetaldehyde
(c) Hexanal (d) Ethanol
14. Which of the following compounds containing
carbonyl group will give coloured crystalline
compound with
[Kerala (Med.) 2001]
(a) CHCOCl
3
(b)
3 3
CHCOCH
(c) ( )
3 2 5
CHCOOCH (d)
3 2
CHCONH
(e) HO ( C H ) COOH
6 4
15. Which of the following organic compounds
exhibits positive Fehling test as well as iodoform
test
[MP PET 1994; KCET 2001]
(a) Methanal (b) Ethanol
(c) Propanone (d) Ethanal
16. Which of the following compound will undergo
self aldol condensation in the presence of cold
dilute alkali
[CBSE PMT 1994]
(a) C HCHO
6 5
(b) CH CHCHO
3 2
(c) CH C CHO (d) CH CH CHO
2
17. Acetaldehyde when treated with dilute NaOH
gives
[EAMCET 1998]
(a) CH CH OH
3 2
(b) CH COOH
3
(c) CH CHO
OH
CH CH
2
|
3
(d)
3 3
CH CH
18. C HCHO
2 5
and CH CO
3 2
( ) can be distinguished by
testing with [EAMCET 199
MP PMT 1996; RPMT 1997, 99]
(a) Phenyl hydrazine (b) Hydroxylamine
(c) Fehling solution (d) Sodium bisulphite
19. Which of the following will undergo aldol
condensation
[IIT 1998]
(a) Acetaldehyde (b) Propanaldehyde
(c) Benzaldehyde (d)
Trideuteroacetaldehyde
20. Which of the following oxidation reactions can be
carried out with chromic acid in aqueous acetone
at
C
o
5 10
[Roorkee Qualifying 1998]
(a)
3
|
3 23
( ) CH
OH
CH CH C C CH
(b) CH CH CH CH CHOH
3 23 2
CH CH CH CH CHO
3 23
(c) C HCH CHCOOH
6 5 3 6 5
(d) CH CH CHOH CH CH CHO
3 23 2 3 23
21. Acetaldehyde cannot show [AIIMS 1997]
(a) Iodoform test (b) Lucas test
(c) Benedict's test (d) Tollen's test
22. Benzaldehyde NaOH
[CPMT 1997, 2001; CBSE PMT 1999; Pb. PMT 1999]
(a) Benzyl alcohol (b) Benzoic alcohol
(c) Hydrobenzamide (d) Cinnamic acid
23. The following reagent converts C HCOCHO
6 5
to
C HCHOHCOONa
6 5
[Roorkee Qualifying 1998]
(a) Aq. NaOH (b) Acidic
2 2 3
NaSO
(c)
2 4 2 4
NaCrO / HSO (d) NaNO / HCl
2
24. Benzyl alcohol and sodium benzoate is obtained
by the action of sodium hydroxide on
benzaldehyde. This reaction is known as [KCE
(a) Perkin’s reaction (b) Cannizzaro’s
reaction
(c) Sandmeyer’s reaction (d)Claisen condensation
25. To distinguish between formaldehyde and
acetaldehyde, we require [Orissa PMT
(a) Tollen's reagent (b) Fehling's solution
(c) Schiff's reagent (d) Caustic soda solution
2
NHNH
2
ON NO
2
3 23 3
||
CH ( CH ) CCCCH
O
47. Which of the following does not turn Schiff's
reagent to pink
[DPMT 1981; CPMT 1989]
(a) Formaldehyde (b) Benzaldehyde
(c) Acetone (d) Acetaldehyde
48. Fehling's test is positive for [KCET 1993]
(a) Acetaldehyde (b) Benzaldehyde
(c) Ether (d) Alcohol
49. Acetaldehyde and acetone differ in their reaction
with
[KCET 1989]
(a) Sodium bisulphite
(b) Ammonia
(c) Phosphorus pentachloride
(d) Phenyl hydrazine
50. The final product formed when acetaldehyde is
reduced with sodium and alcohol is [BHU 1976]
(a) Ethylene (b) Ethyl alcohol
(c) Ethene (d) All of these
51. The compound obtained by the reduction of
propionaldehyde by amalgamated zinc and
concentrated HCl is [MP PMT 1983]
(a) Propanol (b) Propane
(c) Propene (d) All of these
52. Formaldehyde when treated with KOH gives
methanol and potassium formate. The reaction is
known as
[MP PET 1997]
(a) Perkin reaction (b) Claisen reaction
(c) Cannizzaro reaction (d) Knoevenagel reaction
53. Aldehydes and ketones give addition reaction with
[KCET 1992]
(a) Hydrazine (b) Phenyl hydrazine
(c) Semicarbazide (d) Hydrogen cyanide
(e) All of these
54. Acetaldehyde reacts with [CBSE PMT 1991]
(a) Electrophiles only
(b) Nucleophiles only
(c) Free radicals only
(d) Both electrophiles and nucleophiles
55. The typical reactions of aldehyde is [Pb. CET 1986]
(a) Electrophilic addition (b)Nucleophilic substitution
(c) Nucleophilic addition (d)Nucleophilic elimination
56. Which will not give acetamide on reaction with
ammonia
[CPMT 1985]
(a) Acetic acid (b) Acetyl chloride
(c) Acetic anhydride (d) Methyl formate
57. The addition of HCN to carbonyl compounds is an
example of [Haryana CEET 2000]
(a) Nucleophilic substitution
(b) Electrophilic addition
(c) Nucleophilic addition
(d) Electrophilic substitution
58. Which of the following reagents is used to
distinguish acetone and acetophenone [RPMT 2002; KCET 1998]
(a)
3
NaHSO (b) Grignard reagent
(c)
2 4
NaSO (d) NHCl
4
59. The product formed by the reaction of chlorine
with benzaldehyde in the absence of a catalyst is
[Tamil Nadu CET 2002]
(a) Chlorobenzene (b) Benzyl chloride
(c) Benzoyl Chloride (d) o -
Chlorobenzaldehyde
60. Which of the following compound is resistant to
nucleophilic attack by hydroxyl ions
[CBSE PMT 1998; KCET (Med.) 2001; AFMC 2001]
(a) Methyl acetate (b) Acetonitrile
(c) Dimethyl ether (d) Acetamide
61. Glucose molecule reacts with X number of
molecules of phenylhydrazine to yield osazone.
The value of X is
[CBSE PMT 1998]
(a) One (b) Two
(c) Three (d) Four
62. In which of the following reactions aromatic
aldehyde is treated with acid anhydride in
presence of corresponding salt of the acid to give
unsaturated aromatic acid
[BHU 1998, KCET (Med.) 2001]
(a) Friedel-Craft's reaction (b) Perkin reaction
(c) Wurtz reaction (d) None of these
H
MgHg
CH
O
CH C
/
3
||
3
2 Product, product in the
reaction is [RPMT 2003]
(a)
3
|
3
|
3
|
|
3
CH
H
OH
C C
CH
OH
H C C (b)
3
|| ||
3
CH
O
O C
O
CH C
(c)
3
| |
3
CH
OH
CH
OH
CH CH (d) None of these
64. Cinnamic acid is formed when C H CHO
6 5
condenses with CH CO O
3 2
( ) in presence of [Orissa JEE 2003]
(a) Conc.
2 4
HSO (b) Sodium acetate
(c) Sodium metal (d) Anhydrous
2
ZnCl
65. A mixture of benzaldehyde and formaldehyde on
heating with aqueous NaOH solution gives
[IIT-JEE (Screening) 2001]
(a) Benzyl alcohol and sodium formate
(b) Sodium benzoate and methyl alcohol
(c) Sodium benzoate and sodium formate
(d) Benzyl alcohol and methyl alcohol
66. The reaction,
H orOH
OCH CHOH
O
CH C
3 2 5
||
3
OCH CHOH
O
CH C
2 5 3
||
3
is called [MP PMT 2003]
(a) Perkin’s reaction (b) Claisen Schmidt
reaction
(c) Esterification (d) Trans-esterification
67. Formaldehyde reacts with ammonia to give
urotropine. The formula of urotropine is
[MP PMT 1989, 96, 2003; AIIMS 1982; NCERT 1987;
MP PET 1990, 91, 2000; CPMT 1978, 82, 86, 97; KCET 2003]
(a)
2 6 4
( CH ) N
(b)
24 3
( CH ) N
(c)
26 6
( CH ) N (d)
23 3
( CH ) N
68. Aldol condensation will not take place in
[CBSE PMT 1996, 99; RPMT 1999; CPMT 1988, 04]
(a) HCHO (b) CH CHCHO
3 2
(c) CH CHO
3
(d)
3 3
CHCOCH
69. Contents of three bottles were found to react
(i) Neither with Fehling's solution nor with
Tollen's reagent
(ii) Only with Tollen's reagent but not with
Fehling's solution
(iii) With both Tollen's
reagent and Fehling's solution.
If they contained either ethanal (acetaldehyde)
or propanone (acetone) or benzal
(benzaldehyde), which bottle contained which
(a) In (i) benzal, in (ii) ethanal and in (iii)
propanone
(b) In (i) benzal, in (ii) propanone and in (iii)
ethanal
(c) In (i) propanone, in (ii) benzal and in (iii)
ethanal
(d) In (i) propanone, in (ii) ethanal and in (iii)
benzal
70. Action of hydrazine on aldehydes and ketones
gives compound of the general structure
(a)
2
C N NH
(b) C N OH
(c)
2
C N NH CONH
(d)
6 5
C N NH CH
71. The reaction in which sodium cyanide is used
[MP PET/PMT 1998]
(a) Perkin reaction (b) Reimer-Tiemann
reaction
(c) Benzoin condensation (d)Rosenmund reaction
72. Which one of the following reactions is a method
for the conversion of a ketone into a hydrocarbon
[MP PET/PMT 1998; CBSE PMT 1989]
(a) Aldol condensation (b) Reimer-Tiemann
reaction
(c) Cannizzaro reaction (d) Wolf-Kishner
reduction
73. Bakelite is a polymer of [DPMT 1996; MP PET 2002]
(a) HCHO phenol
(b) HCHO aldehyde (acetaldehyde)
(c) Phenol
2 4
H SO
(d) HCHO acetone
74. Clemmenson reduction involves C O to
2
CH
in presence of [DPMT 1996]
(a) Zn / Hg (b) Alcohol
(c) Zn dust (d) Zn / alcohol
75. Aldol condensation involving CH CHO CHCHO
3 3
gives the product [DPMT 1996]
(a) CH CHOHCHCHO
3 2
(b)
3 2 3
CHCOCH CH
(c)
3 2
CH CH CH (d) None of these
76. Enol content is highest in [Orissa JEE 2
(a) Acetone (b) Acetophenone
(c) Acetic acid (d) Acetyl acetone
77. Which one of the following reacts with HCN and
Tollen's reagent, but is not oxidised by Fehling's
solution
(a) Methanal (b) Ethanal
(c) Benzaldehyde (d) Acetone
78. During reaction of benzaldehyde with alkali one
of the product is
(a) Phenol (b) Benzyl alcohol
(c) Benzene (d) Benzophenone
79. Cannizzaro reaction is given by [DPMT 1996]
(a) HCHO (b)
3 3
CHCOCH
(c) CH CHO
3
(d) CH CH OH
3 2
80. The reaction
C HCHO CH CHO CHCH CH CHO
6 5 3 6 5
is known as [BHU 1996]
(a) Perkin's reaction (b) Claisen condensation
(c) Benzoin condensation (d)Cannizzaro's reaction
81. When two molecules of acetaldehyde condense in
the presence of dilute alkali, it forms [Bihar MEE 1996]
(a) Acetal (b) Sodium formate
(c) Aldol (d) Mesitylene
(e) None of these
82. Acetaldehyde on treatment with dil. NaOH
followed by heating gives [CET Pune 19
(a) CH CHCHCHOH
3 2 2 2
(b) CH CHCHCHO
3 2 2
(c) CH CH CHCHO
3
(d) CH CH CHCH OH
3 2
83. Reaction OH
CN
R
CO HCN R C
R
R
|
|
is
[Kurukshetra CEE 1998; IIT 1990]
(a) Electrophilic substitution
(b) Electrophilic addition
(c) Nucleophilic addition
(d) Nucleophilic substitution
84. Benzaldehyde on reaction with acetophenone in
the presence of sodium hydroxide solution gives [BVP 2003]
105. When
3 3
CHCOCH
reacts with
2
Cl
and NaOH ,
which of the following is formed [CPMT 1996]
(a)
3
CHCl (b)
4
CCl
(c)
2 2
CCl H
(d) CH Cl
3
106. Which gives difference between aldehyde and
ketone
[CPMT 1994]
(a) Fehling's solution (b) Tollen's reagent
(c) Schiff's reagent (d) Benedict's solution
(e) All of these
107. Aldehyde turns pink with [Bihar MEE 1997]
(a) Benedict solution (b) Schiff reagent
(c) Fehling solution (d) Tollen's reagent
(e) Mollisch reagent
108. Which of the following would undergo aldol
condensation
[MP PMT 1986; BHU 1995]
(a) CCl. CHO
3
(b) CHO
CH
CH
CH C
3
|
3
|
3
(c) CH. CH. CHO
3 2
(d) HCHO
109. The reaction of acetaldehyde with conc.
4
KMnO
gives
[DPMT 1982; AIIMS 1996]
(a) CHCOOH
3
(b) CH CHOH
3 2
(c) HCHO (d) CHOH
3
110. When acetaldehyde is heated with Tollen's
reagent, following is obtained [CPMT 1989; MP PET/PMT 1988]
(a) Methyl alcohol (b) Silver acetate
(c) Silver mirror (d) Formaldehyde
111. Boiling point of acetone is [CPMT 1975, 89]
(a) C
o
56 (b) C
o
60
(c)
C
o
100 (d)
C
o
90
112. Urotropine is
(a) Hexamethylene tetramine
(b) Hexaethylene tetramine
(c) Hexamethylene diamine
(d) None of these
113. Magenta is [DPMT 1982; Kurukshetra CEE 1998]
(a) Alkaline phenolphthalein
(b) Methyl red
(c) p- rosaniline hydrochloride
(d) Red litmus
114. An aldehyde on oxidation gives [CPMT 1973, 03;
DPMT 1983; Manipal MEE 1995]
(a) An alcohol (b) An acid
(c) A ketone (d) An ether
115. The reaction of an aldehyde with hydroxylamine
gives a product which is called [MP PET 1993; AFMC 2002]
(a) Aminohydroxide (b) Hydrazone
(c) Semicarbazone (d) Oxime
116. Cannizzaro reaction is not shown by
[BHU 1980; IIT 1983; KCET 1993; Bihar MEE 1995;
RPMT 1997, 2000, 02]
(a) HCHO (b) C HCHO
6 5
(c) CH CHO
3
(d) All of these
117. When acetone is heated with hydroxylamine, the
compound formed is [MP PMT 1993]
(a) Cyanohydrin (b) Oxime
(c) Semicarbazone (d) Hydrazone
118. The product of the reaction between ammonia and
formaldehyde is [MP PMT 1993]
(a) Urotropine (b) Formamide
(c) Paraformaldehyde (d) Methanol
119. Which of the following products is obtained by
the oxidation of propionaldehyde [CPMT 1989]
(a) Acetic acid
(b) Formic acid and acetic acid
(c) Propanoic acid
(d) n- propyl alcohol
120. When acetaldehyde reacts with ,
5
PCl the resulting
compound is [MP PMT 1992, 93]
(a) Ethyl chloride (b) Ethylene chloride
(c) Ethylidene chloride (d) Trichloro
acetaldehyde
121. Benzaldehyde and acetaldehyde can be
differentiated by
(a) HCN (b) NH OH
2
(c) Hydrazine (d) NaOH solution
122. In the presence of a dilute base C HCHO
6 5
and
CH CHO
3
react together to give a product. The
product is
[MP PET 1994]
(a)
6 5 3
CHCH (b) C HCHCH OH
6 5 2 2
(c) C HCHOH
6 5 2
(d) C HCH CHCHO
6 5
123. Grignard's reagent reacts with ethanal
(acetaldehyde) and propanone to give
(a) Higher aldehydes with ethanal and higher
ketones with propanone
(b) Primary alcohols with ethanal and secondary
alcohols with propanone
(c) Ethers with ethanal and alcohols with
propanone
(d) Secondary alcohols with ethanal and tertiary
alcohols with propanone
124. Base catalysed aldol condensation occurs with
[IIT-JEE 1991]
(a) Benzaldehyde
(b) 2, 2-dimethyl propionaldehyde
(c) Acetaldehyde
(d) Formaldehyde
125. Benzaldehyde reacts with ammonia to form
[CPMT 1989; AFMC 1998]
(a) Benzaldehyde ammonia
(b) Urotropine
(c) Hydrobenzamide
(d) Aniline
126. Glucose + Tollen's reagent Silver mirror shows
[CPMT 1997]
(a) Presence of acidic group
(b) Presence of alkaline group
(c) Presence of ketonic group
(d) Presence of aldehyde group
127. Fehling solution is [MP PMT 1989]
(a) Ammoniacal cuprous chloride solution
(b) Acidified copper sulphate solution
(c) Copper sulphate and sodium hydroxide +
Rochelle salt
(d) None of these
128. Reduction of an aldehyde produces
[MP PMT 1994; MP PET 2001]
(a) Primary alcohol (b) Monocarboxylic acid
(c) Secondary alcohol (d) Tertiary alcohol
129. Which of the following on reaction with conc.
NaOH gives an alcohol [MP PET 1996]
(a) Methanal (b) Ethanal
(c) Propanal (d) Butanal
130. Schiff's reagent is [MP PMT 1989]
(a) Magenta colour solution decolourised with
sulphurous acid
(b) Ammoniacal cobalt chloride solution
(c) Ammoniacal manganese sulphate solution
(d) Magenta solution decolourised with chlorine
131. Pyrolysis of acetone gives CH C O
2
called
(a) Methylene oxide
(b) Methyl carbon monoxide
(c) Ketene
(d) Methone
132. Which one of the following on oxidation will not
give a carboxylic acid with the same number of
carbon atoms
[CBSE PMT 1992; MP PET 1996]
(a)
3 3
CHCOCH (b) CCl CHCHO
3 2
(c) CH CH CHOH
3 2 2
(d) CH CHCHO
3 2
133. Acetal is obtained by reacting in the presence of
dry HCl and alcohol with [MP PET 1996]
(a) Aldehyde (b) Ketone
(c) Ether (d) Carboxylic acid
134. The reagent with which both aldehyde and
acetone react easily is [CPMT 1973, 74, 89; BIT 1992]
(a) Fehling's reagent (b) Grignard reagent
(c) Schiff's reagent (d) Tollen's reagent
135. Phenylmethanol can be prepared by reducing the
benzaldehyde with [CBSE PMT 1997]
(a) CH Br
3
(b) Zn and HCl
(c) CH Br
3
and Na (d) CH I
3
and Mg
136. Which of the following is used in the manufacture
of thermosetting plastics
(a) Formaldehyde (b) Acetaldehyde
(b) Acetone (d) Benzaldehyde
137. Which compound undergoes iodoform reaction
[DPMT 1984; CPMT 1989]
(a) HCHO (b) CHCHO
3
(c) CHOH
3
(d) CHCOOH
3
138. Which does not react with Fehling solution [MNR 1983, 93]
(a) Acetaldehyde (b) Benzaldehyde
(c) Glucose (d) Formic acid
139. Which of the following compound will react with
ethanolic KCN [IIT-JEE 1984]
(a) Ethane (b) Acetyl chloride
(c) Chlorobenzene (d) Benzaldehyde
140. Schiff's reagent gives pink colour with
[EAMCET 1980; MP PMT 2000]
(a) Aldehydes (b) Ethers
(c) Ketones (d) Carboxylic acid
141. Acetaldehyde reacts with
2
Cl (in excess) to give
[MP PMT 1997]
(a) Chloral (b) Chloroform
(c) Acetic acid (d) Trichloroacetic acid
142. The compound which reacts with Fehling solution
is
[CPMT 1989]
(a) C HCOOH
6 5
(b) HCOOH
(c) C HCHO
6 5
(d)
2 3
CHClCH
143. Which one of the following undergoes reaction
with 50% sodium hydroxide solution to give the
corresponding alcohol and acid [AIE
(a) Butanal (b) Benzaldehyde
(c) Phenol (d) Benzoic acid
144. Which one of the following is reduced with zinc
and hydrochloric acid to give the corresponding
hydrocarbon
[AIEEE 2004]
(a) Acetamide (b) Acetic acid
(c) Ethyl acetate (d) Butan– 2 – one
[MP PET 2004]
(a) Ketone and acid (b) Phenol and acid
(c) Aldehyde and acid (d) Alcohol and phenol
166. Paraldehyde is
[CPMT 1985; MP PET 1992, 96; RPMT 2000]
(a) A trimer of formaldehyde
(b) A trimer of acetaldehyde
(c) A hexamer of formaldehyde
(d) A hexamer of acetaldehyde
167. Paraldehyde is used as a [CBSE PMT 1989]
(a) Medicine (b) Poison
(c) Polymer (d) Dye
168. Formalin is an aqueous solution of
[BHU 1979; DPMT 1983]
(a) Formic acid (b) Formaldehyde
(c) Fluorescein (d) Furfuraldehyde
169. Hexamethylene tetramine is used as [MP PMT 1979, 84]
(a) Analgesic (b) Antipyretic
(c) Urinary antiseptic (d) All of these
170. Methyl ketone group is identified by [BCECE 2005]
(a) Iodoform test (b) Fehling solution
(c) Tollen’s reagent (d) Shiff’s reagent
171. Which of the following does not give Fehling
solution test?
[BCECE 2005]
(a) Acetone (b) Propanal
(c) Ethanal (d) Butanal
172. How will you convert butan 2 one to propanoic
acid?
[IIT 2005]
(a) Tollen’s reagent (b) Fehling’s solution
(c) NaOH/I 2 /H
(d) NaOH/NaI/H
173. Ketones react with Mg-Hg over water gives [AFMC 2005]
(a) Pinacolone (b) Pinacols
(c) Alcohols (d) None of these
174. Which of the following will form two isomers
with semi carbazide [Orissa JEE 2005]
(a) Benzaldehyde (b) Acetone
(c) Benzoquinone (d) Benzophenone
175. A compound
5 10 2
A CH Cl
on hydrolysis gives
C H O
5 10
which reacts with NH OH
2
, forms
iodoform but does not give fehling test. A is [DPMT 2005]
(a)
2 2 3
|
|
3
CH CH CH
Cl
Cl
CH C
(b)
2 3
|
|
3 2
CHCH
Cl
Cl
CH CH C
(c)
Cl
Cl
CH CHCH CH CH
|
|
3 2 2 2
(d)
2 3
| |
3
CH CH
Cl
CH
Cl
CH CH
176. CH CHO HCN A
3
; Compound A on
hydrolysis gives [Kerala CET 2005]
(a) CH CH COOH
3 2
(b)
3 2 2 2
CH CH CH NH
(c) CH CO COOH
3
(d) CH CO CH NOH
3
(e) COOH
OH
CH CH
|
3
177. Which one does not give cannizzaro's reaction
[Kerala CET 2005]
(a) Benzaldehyde
(b) 2 - methyl propanal
(c) p - methoxy benzaldehyde
(d) 2,2 dimethyl propanal
(e) Formaldehyde
1. Which of the following will fail to react with
potassium dichromate and dilute sulphuric acid
(a) Ethyl alcohol (ethanol)
(b) Acetaldehyde (ethanal)
(c) Secondary propyl alcohol (2-propanol)
(d) Acetone (propanone)
2. Acetone and acetaldehyde are differentiated by
[CPMT 1987, 93]
(a)
2
NaOH I
(b)
3 2
Ag ( NH )
(c)
2
HNO (d)
2
I
3. Which of the following will react with water [IIT 1998]
(a)
3
CHCl
(b) ClCCHO
3
(c)
4
CCl (d) ClCH CH Cl
2 2
4. An organic compound ‘ A ’ has the molecular
formula ,
3 6
CHO it undergoes iodoform test. When
saturated with dil. HCl is gives ‘ B ’ of molecular
formula C H O
9 14
. A and B respectively are [Tamil Nadu CET 2002]
(a) Propanal and mesitylene
(b) Propanone and mesityl oxide
(c) Propanone and 2,6–dimethyl – 2, 5-heptadien–
4 – one
(d) Propanone and mesitylene oxide
5. Which alkene is formed from the following
reaction 2 Butanone
3 2 2 3
CHCHCHCH PPh
[Manipal 2001]
(a) 3 - Methyl- 3 - heptene
(b) 4 - Methyl- 3 - heptene
(c) 5 - Methyl- 3 - heptene
(d) 1 - Methyl- 5 - methane
6. Compound ‘ A ’ (molecular formula ) 3 8
CHO is
treated with acidified potassium dichromate to
form a product ‘ B ’ (molecular formula ).
3 6
CHO ‘ B ’
forms a shining silver mirror on warming with
ammoniacal silver nitrate. ‘ B ’ when treated with
an aqueous solution of H NCONHNH. HCl
2 2
and
sodium acetate gives a product ‘ C ’. Identify the
structure of ‘ C ’ [IIT-JEE (Screening) 2002]
(a)
3 2 2
CH CHCH NNHCONH
(b)
2
3
|
3
CONH
CH
CH CH NNH
(c)
2
3
|
3
NHNH
CH
CH CH NCO
(d)
3 2 2
CH CHCH NCONHNH
7. Which is not true about acetophenone [Manipal 2002]
(a) Reacts to form 2, 4-dinitorphenyl hydrazine
(b) Reacts with Tollen’s reagent to form silver
mirror
(c) Reacts with I / NaOH
2
to form iodoform
(d) On oxidation with alkaline
4
KMnO followed
by hydrolysis gives benzoic acid
8. The enol form of acetone, after treatment with
2
DO gives
[IIT-JEE (Screening) 1999]
(a)
OD
CH C CH
|
3 2
(b)
3
||
3
CD
O
CD C
(c)
CH D
OH
CH C
2
|
2
(d) CD
OD
CD C
|
2
9. The appropriate reagent for the transformation
[IIT-JEE (Screening) 2000]
(a) Zn ( Hg ), HCl (b)
NH NH OH
2 2
(c) H / Ni
2
(d)
4
NaBH
10. Which of the following has the most acidic
hydrogen
[IIT-JEE (Screening) 2000]
(a) 3 - hexanone (b) 2, 4-hexanedione
(c) 2, 5-hexanedione (d) 2, 3-hexanedione
11. Which of the following will be most readily
dehydrated in acidic conditions [IIT-JEE (Screening) 2000]
(a) (b)
(c) (d)
Major Product is [IIT-JEE (Screening) 2003]
(a)
(b)
(c)
(d)
13. Among the given compounds, the most susceptible
to nucleophilic attack at the carbonyl group is [IIT 1997]
(a) MeCOCl (b) MeCHO
(c) MeCOOMe (d) MeCOOCOMe
14. Which of the following will give yellow
precipitate with I / NaOH
2
[IIT 1997]
O
HO
3
CH
HO
2 3
CHCH
O
OH
OH
O
OH
O
OH
COOH
COOH
HOOC
HOOC
HO
COOH
HOOC
HO
CH 2 OH
CH
2
OH
HOHC
2
HOHC
2
O
O
O
O
iiH HO
C
o
iNaOH
2
() /
() / 100
CHO
CHO
OHC
OHC
(c) CH CO O
3 2
(d) CHO COOH
28. The major organic product formed from the
following reaction [CBSE PMT 2005]
(a) (b)
(c) (d)
29. Products of the following reaction
...are
( 2 )
( 1 )
3 2 3
3
Hydrolysis
O
CH C CCH CH [CBSE PMT 2005]
(a) CH CHO CHCHCHO
3 3 2
(b) CH COOH CHCH CHO
3 3 2
(c)
3 2 3
CH COOH HOOCCH CH
(d)
3 2
CH COOH CO
30. A compound, containing only carbon, hydrogen
and oxygen, has a molecular weight of 44. On
complete oxidation it is converted into a
compound of molecular weight 60. The original
compound is [KCET 2005]
(a) An aldehyde (b) An acid
(c) An alcohol (d) an ether
Read the assertion and reason carefully to mark the
correct option out of the options given below :
(a) If both assertion and reason are true and the
reason is the correct explanation of the assertion.
(b) If both assertion and reason are true but reason is
not the correct explanation of the assertion.
(c) If assertion is true but reason is false.
(d) If the assertion and reason both are false.
(e) If assertion is false but reason is true.
1. Assertion : Acetic acid does not undergo haloform
reaction.
Reason : Acetic acid has no alpha hydrogens.
[IIT 1998]
2. Assertion : Benzonitrile is prepared by the
reaction of chlorobenzene with
potassium cyanide.
Reason : Cyanide ( CN
) is a strong nucleophile.
[IIT 1998]
3. Assertion : Lower aldehyde and ketones are
soluble in water but the solubility
decreases as molecular mass
increases.
Reason : Aldehydes and ketones can be
distinguished by Tollen's reagent. [AIIMS 1994]
4. Assertion : Acetaldehyde on treatment with
alkaline gives aldol.
Reason : Acetaldehyde molecules contains
hydrogen atom. [AIIMS 1997]
5. Assertion : Acetylene on treatment with alkaline
4
KMnO
produce acetaldehyde.
Reason : Alkaline
4
KMnO is a reducing agent.
[AIIMS 2000]
6. Assertion : Acetophenone and benzophenone can
be distinguished by iodoform test.
Reason : Acetophenone and benzophenone both
are carbonyl compounds. [AIIMS 2002]
7. Assertion : Isobutanal does not give iodoform
test
Reason : It does not have -hydrogen. [AIIMS 2004]
8. Assertion : Benzaldehyde is more reactive than
ethanol towards nucleophilic attack.
Reason : The overall effect of – I and +R effect
of phenyl group decreases the
electron density on the carbon atom
of C O
group in benzaldehyde.
9. Assertion : Aldol condensation can be catalysed
both by acids and bases.
Reason : -Hydroxy aldehydes or ketones
readily undergo acid catalysed
dehydration.
10. Assertion : Ketones are less reactive than
aldehydes.
Reason : Ketones do not give schiff's test.
11. Assertion : Oximes are less acidic than hydroxyl
amine.
Reason : Oximes of aldehydes and ketones
show geometrical isomerism.
12. Assertion : The bond energy of C O
is less
than
C C < in alkenes.
Reason : The carbon atom in carbonyl group is
2
sp hybridised.
13. Assertion :
R C 0 is more stable than
0
R C.
Reason : Resonance in carbonyl compound
provides C
and O
14. Assertion : Formaldehyde cannot be prepared by
Rosenmund's reduction.
iiLiAlH iiiHO
CHNH
4 2
3 2
() ( )
(i)
is
O
OH
3
NCH
H
H
NCH
3
3
O. NHCH
OH
3
NCH
H
Reason : Acid chlorides can be reduced into
aldehydes with hydrogen in boiling
xylene using palladium or platinum
as a catalyst supported on barium
sulphate. This is known as
Rosenmund's reduction.
15. Assertion : CH CHO 3
reacts with
3
NH to form
urotropine.
Reason : Urotropine is used as medicine in
case of urinary troubles.
16. Assertion : -Hydrogen atoms in aldehydes and
ketones are acidic.
Reason : The anion left after the removal of -
hydrogen is stabilized by inductive
effect.
17. Assertion : 2, 2 – Dimethyl propanal undergoes
Cannizzaro reaction with
concentrated NaOH.
Reason : Cannizzaro is a disproportionation
reaction.
18. Assertion : Benzaldehyde undergoes aldol
condensation.
Reason : Aldehydes that do not have –
hydrogen undergo aldol condensation.
Introduction
1 a 2 b 3 a 4 c 5 a
6 c 7 b 8 b 9 a 10 b
11 b 12 d 13 d 14 b 15 a
16 c 17 c 18 c
HCHO CHCHO CHCHO
3 6 5
Preparation
1. (c)
HO
CHMgX
HSO
HgSO
HC CH CHCHO
2
3
2 4
4
(A )
3
20 %
1 %
Acetone
3 3
[]
(B)
3 3
CH CHOHCH CHCOCH
O
4. (b) 3 2 32 3 3
3
CH C CCH CH CO CH
O
5. (c) Ketonic hydrolysis:
3 2 2 5
CH CO CHCOOCH
3 3 2 5 2
2
CHCOCH CHOH CO
H O
NaOH
6. (c)
3
3
AlCl
CH COCl
It is Friedel-Crafts reaction. Acetophenone
9. (c) CH COCl CHCHO HCl
Pd BaSO
H
3
/
2
3
4
10. (c)
2 2
CrOCl
Etard reaction
11. (c)
Buty lalcohol
3 3 33
3
tert
CHMgI
Acetone
CHCOCH CH COH
13. (a) It is hydration of alkynes.
Butanone
3
||
3 2 3 2
2
CH
O
CH CH C CH CH CH C
HO
Hg
14. (d)
3
Acetone
3 3
Dry heating
CH CO CH CaCO
16. (c) CH COCl HCl
AlCl
3
only
3
18. (d)
Distill
3
3
OOCH
OOCH
Ca Ca
CHCOO
CHCOO
3 3
2 CH CHO 2 CaCO
19. (c) MgBr
CH
CH C N CHMgBr CH C N
3
|
3 3 3
OH
Br
CH CO CH NH Mg
3 3 3
23. (c)
ethy l methy lketone
2 3
||
3
Oxidation
2 Butanol
2 3
|
3
4
CHCH
O
CH CH CH C
OH
CH CH
KMnO
24. (c)
22
CrOCl
4
2 27
or
acidic
KMnO
K CrO
This is Etard’s reaction
32. (d)
Ketone
Aluminiumterbutoxide
[(CH) ]
Isopropy lalcohol
3 3 3
C O
R
R
CH OH
R
R
CO Al
34. (b) HC CH HO CH CHO
HgSO HSO
3
/
2
4 2 4
42. (a) 43. (a)
2 , 2 dimethy l propanal
2 butanone
3 2 3
3
|
3
|
9 18 3 3
CHCHCOCH
CH
CH
CH O HC C CHO
On the basis of product formation, it would be
alkene
2 , 2 , 4 trimethy l- 3 - hexene
2 3
3
|
3
|
3
|
3
CHCH
CH
C
CH
CH
CH C HC
3
2 3
3
|
3
|
3
|
3
O
CH CH
CH
C
CH
CH
CH C HC
3
|
|
2 3
|
3
|
3
|
3
—
CH
O
CCHCH
O
O
HC
CH
CH
CHC
O
CHO CHC CHCH
CH
CH
CH C
||
3 2 3
3
|
3
|
3
Properties
1. (c) CH COCH CHMgCl CH C OMgCl
33
(X)
3 3 3
CH C OH MgOHCl
Y
()
33
hy droly sis
2. (c) It is cannizzaro reaction – 2
KOH
3. (a)
4
( )
LiAlH
A
HCN
OH
CN
R CO R R C R
CHO
Cl
COO
Cl
CH OH
2
Cl
3
COCH
CH 3 CHO
CH C O
O
3
||
O
O
CH C
||
3
Ca
COCH
3
Hydrolysis
CH
3
3
CH
CHO
3
CH
COOH
ozonolysis
CH 3
7
6
1
5
4
3
2
1
2
5
3
4
6
CH 3
7
6
5
4
3
2
1
C=O
HC=O
6 - oxoheptanal
OH
R
R C CHNH
|
|
'
2 2
5. (c) Reduction of C O to 2
CH can be carried
out with Wolf Kischner reduction.
6. (d)
2 H
on reduction it gives benzylalcohol and not
phenol.
9. (c)
Acetophenone
6 5 3
[]
1 Phenylethanol
6 5 3
C HCHOHCH CHCOCH
O
C H CHCOCl CHCOCH HCl
6 5 3
reaction
Friedelcraft's
6 6 3
10. (b) Wolf-Kishner reduction does not convert CO
to CHOH but converts it to
2
CH.
11. (c) Although both
3 2 3
CHCHCOCH and
33 3
( CH ) CCOCH
contain - hydrogen, yet
33 3
( CH ) CCOCH does not undergo Aldol
condensation due to steric hindrance.
12. (a)
2 Alcohol
6 5 3
/ Benzaldehyde
6 5
2
3
C HCHO CHCHOHCH
H HO
CHMgBr
13. (a) Chloral ,
3
CClCHO has no -hydrogen atom and
hence does not undergo aldol condensation.
14. (b) Among the given compounds only acetone
gives crystalline coloured derivative with 2, 4
DNP.
15. (d) Ethanal among the given compounds gives
positive iodoform test.
17. (c) CHCHO
OH
CH CHO CH CH
NaOH
2
|
3
dil.
3
18. (c) C HCHO Cu OH CuO HO
d ppt
2
Re
2
2
2 5
C HCOO
2 5
2 5 Noreaction
2
3 3
CHCOCH Cu OH
19. (abd)Deuterium behaves like H
and hence
trideuteroacetaldehyde also undergoes aldol
condensation but benzaldehyde does not since
it has no -hydrogen.
21. (b)
ZnCl HCl o
/
2
1 Primary alcohol
White turbidity only heating
o ZnCl HCl
Alcohol
/ 2
2 White turbidity
after 5 min heating
o ZnCl / HCl 2
3 Alcohol easily in seconds
24. (b) Benzaldehyde on treatment with 50% aqueous
or ethanolic alkali solution undergoes
Cannizzaro’s reaction like HCHO (no -
hydrogen atom) i.e. , one molecule is oxidised
and one is reduced with the formation of
benzoic acid and benzyl alcohol respectively.
C HCHO CHCHOH CHCOONa
NaOH
6 5 6 5 2 6 5
2
25. (d) HCHO CHOH HCOONa
Conc
NaOH
3
.
It is a Cannizzaro’s reaction.
CH CHO
OH
CH CHO CH CH
dil
NaOH
2
|
3 3
2
It is aldol condensation reaction.
2 7. (d)
2 3
||
3 2
CH CH
O
CH CH C do not have
O
CH C
||
3
group
29. (b) CCl HCl
O
CH Cl CH C
O
CH C 3 3
3
||
3 2 3
||
3
O
CCl NaOH CHCl CH C ONa
O
CH C
||
3 3 3
||
3
30. (b) ONa
O
I NaOH CHI CH C
O
CH C CH
||
3 3
dimethy lketone
2
||
3 3
3
31. (c)
3
CHI
is yellow compound when iodine reacts
with NaOH and ketone.
32. (c) HCHO HCHO HCOOK CHOH
KOH
3
38. (b) 2
Conc. NaOH
This reaction is called as Cannizzaro’s
reaction.
39. (d) +
KOH
Conc.
41. (d) The solution represented is fehling’s and it
has no tendency to oxidise benzaldehyde.
42. (a) Increasing alkyl group the reactivity
decreases.
43. (d) RCHO O RCOOH
2
2
1
44. (d) All test for Aldehyde because ketone require
strong oxidising agent.
Ag NH RCHO RCOOH Ag NH HO
3 2 3 2
2 [ ( )] 2 4
45. (a) Silver mirror test is the test of aldehyde. 46. (c)
2 [ ( ) ]
3 32
CHCH CHCHO AgNH
Ag NH CHCH CHCOOH HO
3 3 2
CHO
Benzaldehy
de
CH OH
2
Benzylalco
hol
CHO
3
CH
COONa CHOH
3
CHO
3
CH
Cl
CHO
3
CH
Cl
COOK
Cl
CHOH
3
Cl
