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

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)

69. Which one of the following reactions would give the product as it is planned? (A) (B)  (C) (D) (E)

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

 30. 在自由基氯化反應的起始步驟(the initiation step of a free radical chlorination reaction)， 下列那一種描述是正確的？ (A) ΔH° > 0 and ΔS° > 0 (B) ΔH° > 0 and ΔS° < 0 (C) ΔH° < 0 and ΔS° > 0 (D) ΔH° < 0 and ΔS° < 0

31. 化合物 FCH2CH2F 之最穩定的構型如下:  請問化合物 FCH2CH2OH 之最穩定的構型為何？ (A) (B) (C) (D)

65. What is the relative reactivity of 2° vs 1° hydrogens in the free radical bromination of n-butane if the ratio of 1-bromobutane to 2-bromobutane formed is 7:93? (A) The 2° hydrogens are 20 times more reactive than the 1° ones. (B) The 2° hydrogens are 40 times more reactive than the 1° ones. (C) The 2° hydrogens are 60 times more reactive than the 1° ones. (D) The 2° hydrogens are 80 times more reactive than the 1° ones. (E) The 2° hydrogens are 100 times more reactive than the 1° ones.

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.

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

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

71. Below is a propose a synthesis of compound A. Which step would not work. 

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