49. In the following reaction, which compound is the major product? 

49. 關於下列反應何者不是經過苯炔(benzyne)中間體？ (A) (B)(C) (D) (E)

24. 下列何者為 1,2-二溴-4 硝基苯(1,2-dibromo-4-nitrobenzene)和氫氧化鈉加熱下進行親合性芳香烃取代 反應(nucleophilic aromatic substitution reaction)的中間產物？

43. 哪一個化合物進行 SNAr 的反應時有最高的反應速率？ 

29. Which compound would undergo SNAr reaction most rapidly with sodium methoxide? (A)  (B)  (C) (D) (E)

60. Which statement is correct for the reaction shown below? 1-chloro-2,4-dinitrobenzene + NaOH → 2,4-dinitrophenol (A) This reaction is an electrophilic aromatic substitution. (B) This reaction is a SN1 substitution. (C) This reaction is a nucleophilic aromatic substitution. (D) Substituted benzyne is the reaction intermediate. (E) None of the above. II. Choose one correct answer for the following questions 

51. In the following reaction, which compound is the major product? 

11. 下列醇類分子(I−III)，在酸性條件下解離(ionization)產生碳陽離子的難易程度，由難至易依序為何？ (A) I ＜ III ＜ II (B) II ＜ III ＜ I (C) III ＜ I ＜ II (D) III ＜ II ＜ I

50. Which reagent would be best suited for the transformation shown?  (A) alkaline Cu2 in H2O (B) Ag in H2O/NH3 (C) H2, with Ni catalyst (D) NaNO3 at 0°C (E) NaBH4 in H2O

52. In the following reaction, what is the major product?  

53. In the following reaction, which compound is the major product?  

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