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practice_exam_Practice Exam 2 - Chem 237 Exam 2...

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Chem 237 Exam 2 November 22, 2006 Instructions: You will have 50 minutes to complete as many problems as possible. Where provided, write your answers in the boxes. Your answers will not be graded unless they are in the proper box. Problem Points 1 ____/10 2 ____/7 3 ____/28 4 ____/8 5 ____/16 6 ____/6 7 ____/10 8 ____/15 Total ____/100
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1. For each of the following reactions, draw the carbocation intermediate you would expect in each reaction. Circle the starting material that reacts faster. 10 pts intermediate major product intermediate major product HBr HBr 2. Zidovudine (AZT) (drawn below) is an important anti-HIV medication. 7 pts a. Identify all chirality centers in the molecule with arrows. b. How many total stereoisomers are possible? c. Formal charges are missing from the structure. Draw them in the proper locations. O HO N N N N H N O O
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