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Unformatted text preview: Source 1 CHE321 Exam 3 11/21/2006 Multiple Choice Questions. 60 points Select the best answer to each of the questions. 1. Choose the incorrect reaction. CH 3 H 3 C HgSO 4 H 2 SO 4 O H 2 /Pd Na/NH 3 H 2 /Lindlar HBr Br H H Br (A) (B) (D) (C) (E) 2. Choose the species that could not be used as the base in the following reaction. H + B + HB Li O Na (C) NaH N Li (E) NaNH 2 (A) (B) (D) 3. Professor Lee proposed the following reaction for the preparation of 3-iodo-1-propene from propene. H + I-I I + H-I h ν or heat The following two propagation steps were hypothesized. The relevant bond energies in kcal/mole are shown. H + I + H-I + I-I I 89 71 36 46 + I Reaction 1. Reaction 2. Choose the incorrect statement. (A) The first reaction is endothermic. (B) The second reaction is exothermic. (C) The overall reaction is exothermic. (D) The I–I bond is weaker than the H–I bond. (E) The proposed reaction is not a good method for the preparation of 3-iodo-1-propene from propene. Source 2 4. Here is a reaction that we did not cover in the lectures. H Br 2 H 2 O C 4 H 7 BrO Use your knowledge of mechanisms to choose the most likely product from among the following compounds. O Br OH Br Br OH H O Br Br + enantiomer OH (A) (B) (C) (D) (E) 5. On the final exam in CHE 321 a student was asked to propose a synthesis of compound X and came up with the scheme shown below. Br 2 light Br Li Li H 1. NaNH 2 2....
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- Spring '08
- Reaction, Nucleophilic substitution, Reaction mechanisms, Br Li