68. What product would be obtained for the following reaction? .
(A)
(B)
(C)
(D)
(E)None of the above

19. What method will produce the transformation?  (A) Li / ND3 (B) (sia)2BD then H2O (C) CH3CH2MgBr then D3O+ (D) (sia)2BD then D2O (E) LiAlD4 then D2O

12. 碳化鎂(MgC2(s))置入水中可獲得的產物為何 ？ (A) MgO(s) + MgCO3(aq) (B) Mg(OH)2(s) + Mg(HCO3)2(aq) (C) Mg(OH)2 (s) + HOCH2CH2OH(ℓ) (D) Mg(OH)2(s) + C2H2(g) (E) Mg(OH)2 (s) + CO2(g)

60. Which of the following schemes will proceed to give the compound indicated as the major product. (A) I only (B) I and II (C) II and III (D) I and III (E) all of them

69. When 1-methyl-1-cyclohexene is respectively treated with the following reagent set, which will give the same product? (A) II, V (B) III, IV (C) II, III, V (D) I, V (E) I, III

70. Predict the outcome of the following sequence of reactions. (A) (B) (C) (D) (E)

71. The following substrate is a starting material in the synthesis of compounds having opioid activity. Show all products that would result from the reaction below. (A) I, II, III (B) I, III, IV (C) I, III, V (D) II, III, IV (E) II, IV, V

72. Predict the structure of the hydrolysis product. (A) (B) (C) (D) (E)

73. In order to synthesize the final product shown below, predict when should a protecting group be added and when should it be removed? (A) The hydroxyl group should be protected before step I and removed after step I (B) The hydroxyl group should be protected before step I and removed after step II (C) The hydroxyl group should be protected before step I and removed after step III (D) The hydroxyl group should be protected before step II and removed after step III (E) There is no need for a protecting group in this synthesis.

74. Which of the following Diels-Alder reactions has the largest reaction rate constant? (A) (B) (C) (D) (E)

75. What is the product of this reaction? ?(A) (B) (C) (D) (E)

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