Practice Exam 4 on Organic Chemistry - Fall 2006 | CHEM 221, Exams of Organic Chemistry

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CHEM 221-02 Exam 4 Dr. Sanford December 1, 2006 Name: 1. Multiple Choice 30 pts. 2.& 3. Short Answer 10 pts. 4, Synthesis 10 pts. 5. Predict/Supply 20pts. 6. Mechanism 15 pts. 7. MS 15 pts. Total: 100 pts. 1. Put the letter corresponding to the best answer to the the right of the question (3 pts. each). a. Loratidine is the active ingrediant in the antihistimine Claritin. MS analysis of loratidine shows M¢ at an m/z = 384 and an M*+ 2 peak at m/z= 38¢ in an approximate ration of 3:1 intensity. Loratidine most likely contains which element? le ip . nitrogen . . chlorine . bromine . iodine sawp b. Which of the following statements best describes the base peak in a mass spectrum? A. The peak from the most stable radical B. The peak from the species that has the isotope with the highest atomic number C, The peak of the highest intensity D. The peak from the unfragmented ionized molecule c. The IR of the product from the reaction of cyclobutadiene and ethene would be expected to have which of the following IR profiles? . multiple medium to strong bands from 3050 fo 2850 cm!, weak band at 1640 em! . multiple medium to strong bands from 2900 to 2790 cmr!, weak band at 1640 cm? . multiple medium to strong bands from 3050 to 2800 cnr, strong band at 1640 cm? multiple medium to strong bands from 2900 to 2790 cnr, strong band at 1730 cm! POR,