exam3 - Name: Lab Section, Day/Time: CHEM 8 Exam 3...

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1 CHEM 8 Exam 3 SOLUTIONS November 18, 2010 Closed book, closed notes, calculator OK, molecular models OK 1. (1.5 pts each) For each of the following molecules note whether they have delocalized electrons or only localized electrons. 2a. (6 pts) Polypeptides (or proteins) are some of the most important molecules in biochemistry. For the following small peptide, show how the electrons could be delocalized by showing the resonance contributors. 2b. (3 pts) Use your answer from (a) to justify why structures of proteins show that there is no free rotation around some C-N bonds. There is partial double bond character around each C-N bond involving the carbonyl carbon. Therefore, there is minimal ability to have bond rotation around this bond. Name: Lab Section, Day/Time: R N H H N R ' O O - R N H H N R ' O - O R N H H N R ' O O + + O Cl localized localized delocalized localized delocalized delocalized
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2 3. (4 pts each) For the following S N 2 reactions draw all product(s), showing correct stereochemistry. Assume that only S
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exam3 - Name: Lab Section, Day/Time: CHEM 8 Exam 3...

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