74. What is the major product of the following reaction? 
(A) 
(B) 
(C) 
(D) 
(E) None of the above

40. 下列化合物進行一系列反應後，最終產物為何？ (A) (B) (C) (D) (E)

37. 右方反應的主要產物 D 結構為何？ (A) (B) (C) (D) (E)

複選題79. What is the major product of the following transformation? 

57. Which of the following combinations of reactants would produce a meso compound? (A) Cis-3-hexene and Br2 (B) Trans-3-hexene and Br2 (C) Cis-3-hexene and Br2 in H2O (D) Trans-3-hexene and Br2 in H2O (E) Trans-3-hexene and H2/Pd/C

7. Treatment of (S)-6-chloro-1-methyl-1-cyclohexene with H3O is expected to produce which of the following product(s)?   (A) I and III (B) II (C) II and V (D) IV (E) I, III and V.

75. What is the major product of the following reaction? (A)  (B) (C)  (D) (E) None of the above

76. What is the major product of the following reaction?  (A) (B) (C)  (D) (E) None of the above

77. How to prepare aspirin from phenol? (A) 1. NaOH, CO2 2. H3O 3. Ac2O (B) 1. CH3COCl, AlCl3 2. NaNO2, then H3PO2 3. H3O (C) 1. Ac2O 2. H3O 3. NaOH, CO2 (D) 1. HNO3, H2SO4 2. Fe, HCl 3. CH3COCl, AlCl3 (E) 1. Ac2O 2. NaOH 3. CO2, then H3O

78. What is the major product of the following reaction? (A) (B) (C) (D) (E)

79. 7-Dehydrocholesterol, a steroid found in skin, is converted into vitamin D3 by two pericyclic reactions. What are these two reactions? (A) 1. an electrocyclic reaction 2. an ene reaction (B) 1. a [1,7] sigmatropic rearrangement 2. an electrocyclic reaction (C) 1. an electrocyclic reaction 2. a [1,7] sigmatropic rearrangement (D) 1. an ene reaction 2. an electrocyclic reaction (E) 1. an ene reaction 2. a [1,7] sigmatropic rearrangement

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