71. What is the major product of the following conversions?

(A)
(B)
(C)
(D)
(E) none of the above

64.For the following reaction, select the statement which best describes the situaton.  RCH2OH + (C5H5N)2CrO3→ (A)The alcohol is oxidized to an acid, and the Cr (VI) is reduced. (B)The alcohol is oxidized to an aldehyde, and the Cr (VI) is reduced. (C)The alcohol is reduced to an aldehyde, and the Cr (III) is oxidized (D)The alcohol is oxidized to a ketone, and the Cr (VI) is reduced. (E)The alcohol is oxidized to an acid, and the Cr (III) is reduced.

21. 的最佳合成方法是 (A) (B) (C) (D)

8. 下列哪一種試劑可將2-methylbutan-1-ol轉換成2-methylbutanal？ (A) Na2Cr2O7 (B) O3 (C) KMnO4 (D) PCC(pyridinium chlorochromate)

72. What is the major organic product of the following reaction? (A) (B) (C) (D) (E) none of the above

73. What reagent(s) would you use to accomplish the following conversion? (A) CH3Br, H3O+ (B) CH3MgBr, H3O+ (C) (CH3)2CuLi, H3O+ (D) CH3Br, LiAlH4, H3O+ (E) CH3MgBr, LiAlH4, H3O+

74. What carbonyl compound and what phosphonium ylide are required for the synthesis of the following alkene? (A) only (1) (B) only (2) (C) only (3) (D) (2) and (3) (E) (1),(2),and (3).

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

76. Which of the following is most reactive toward nucleophilic aromatic substitution? (A) (B) (C) (D) (E)

77. What are the products of the following reaction? (A) only (1) (B) only (2) (C) only (3) (D) (1) and (2) (E) (2) and (3)

78. An unknown compound has the formula C8H10OS, and is known to contain a thiophene ring. The proton NMR spectrum of this compound is: 0.98, triplet, 3H; 1.74, multiplet, 2H; 2.80, triplet, 2H; 7.40, multiplet, 1H; 7.55, multiplet, 2H. What is the structure of this compound? (A) (B) (C) (D) (E) none of the above.

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