56. Which will be the major product of the following E2 reaction? 
(A)
(B)
(C)
(D)
(E)

29. (1S,2S)-1,2-dibromo-1,2-diphenylethane 進行 E2 反應所得的主要產物為何？ (A) （Z）-1-bromo-1,2-diphenylethylene (B) （Z）-2-bromo-1,2-diphenylethylene (C) （E）-1-bromo-1,2-diphenylethylene (D) （E）-2-bromo-1,2-diphenylethylene .

19. 當碘烷(alkyl iodide)經過 E2 消去反應(E2 elimination)之後會有多少種不同的烯類產物？ (A) 2 (B) 3 (C) 4 (D) 5

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.

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

43. 選項中，哪一個是反應式之主要產物？ (A) (B) (C) (D)

70. Identify the major product of the reaction below.

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

33. Rank the following compounds in an order of decreasing rate in an E2 reaction. (A) A > B > C (B) A > C > B (C) B > A > C (D) C > A > B (E) C > B > A

32. A primary kinetic isotope effect could most likely to be observed in which of the following mechanisms? (A) SN1 and SN2 (B) SN2 (C) E1 and SN1 (D) E2 (E) E1

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

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