5. What is the major product of the following reaction?

77. Stereoisomers I and II undergo E2 elimination on treatment with sodium ethoxide in ethanol. One isomer reacts 500 times faster than the other. Also, one isomer gives X as the only product, whereas the other gives Y together with some X. Which of the following statements provides the best assignment of I and II?  (A) II reacts faster and gives both Y and X (B) II reacts faster and gives only X (C) I reacts faster and gives both Y and X (D) I reacts faster and gives only Y (E) I reacts faster and gives only X

34. Provide the structure of the major product which results in the following reaction. (A)(B)(C)(D)(E) no reaction

35. To answer the following question, consider the reaction below: The dehydration of alcohol by reaction with POCl3 in pyridine is an example of: (A) E1 process (B) SN1 process (C) E2 process (D) SN2 process (E) None of above.

53. What product would you expect from the following reaction? (A) (B) (C) (D) (E) no reaction

33. 下列消去反應(Elimination Reaction)所產生的主要產物，那一個不正確？

6. Which sequence of reagents works best to convert 3-hexene to 3-hexyne? (A) 1. HCl 2. NaNH2 (B) 1. BH3．THF 2. HO- , H2O2 3. NaNH2 (C) 1. NaNH2 2. HI 3. H3O+ (D) 1. Br2, CH2Cl2 2. NaNH2 (excess) (E) 1. Cl2, CH2Cl2 2. NaCN(excess)

7. Which of the following technique(s) can readily distinguish between: (A) NMR (B) IR (C) MS (D) A and B (E) A and C

8. What is the major product of the following reaction?

9. What is the major product of the following reaction?

10. What is the major product from the following rearrangement?

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