69. Which one of the following reactions would give the product as it is planned?
(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.

31. 下列哪種鹵烷類最適合用來合成革陵蘭試劑(Grignard reagent)？ (A) BrCH2CH2CH2CN (B) CH3COCH2CH2Br (C) (CH3)2NCH2CH2Br (D) H2NCH2CH2Br

42. 請選出下列反應之產物。(A) (B) (C) (D)

55. Provide the structure of the major organic product in the reaction shown below. (A) (B)(C) (D) (E)

37. Which of the following substrates will not form a Grignard reagent when treated with Mg/diethyl ether? (A) (B) (C) (D) (E)

21. What reagent should be used for the following reaction? ?   (A) CH3CH2MgBr (B) CH3CH2Li (C) (CH3CH2)2Zn (D) CH3CH2B(OH)2 (E) (CH3CH2)2CuLi

59. Which of these is the least reactive type of organometallic compound? (A) RK (B) R2Hg (C) RLi (D) R2Zn (E) R3Al

61. The reaction of Cl2 with a methyl radical has a positive ∆H°. Which of these drawings is the best representation of the transition state of this reaction? (A) (B) (C) (D) (E)

40. 下列的兩個 confomational isomers，conformer I 與 conformer II 以 Newman projection 表示如下：試 問其能量差異為何？(已知：H↔ H eclipsed = 4.0 kJ/mol，H↔ CH3 eclipsed = 6.0 kJ/mol，CH3↔ CH3 eclipsed = 11.0 kJ/mol，CH3↔ CH3 gauge = 3.8 kJ/mol；Φ = dihedral angle)   (A) I 比 II 安定 15.2 kJ/mol (B) I 比 II 安定 10.2 kJ/mol (C) I 比 II 安定 11.2 kJ/mol (D) I 比 II 安定 3.8 kJ/mol

36. 下列何者最難生成格里納試劑(Grignard reagent)？ (A) (B) (C)(D) (E)

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