26. What is the major product of the following reaction?

  
(A)
(B)
(C)
(D)
(E) None of the above.

39. 利用四氧化鋨(OsO4)將雙鍵氧化成雙醇(diol)時，若使用催化量的四氧化鋨則需要添加當量數的共同氧化劑 (co-oxidant)。下列何者為最合適的共同氧化劑？ (A) (B) H2O2 (C) (D) NaIO4

26. 有關烯類的環氧化作用(epoxidation)，下列那一項敘述最正確？(A) 烯類的環氧化反應不具有立體選擇性。(B) 以過氧醋酸(CH3CO3H)作為氧化劑，2,3-二甲基-2-丁烯反應速率比反式-2-丁烯快，因為碳-碳雙鏈的 π 電子雲密度高。(C) 以過氧醋酸作為氧化劑，2,3-二甲基-2-丁烯反應速率比反式-2-丁烯慢，因為碳-碳雙鏈有較多的甲基造成空間阻礙。(D) 對 2,3-二甲基-2-丁烯進行環氧化反應，使用過氧三氯醋酸(CCl3CO3H)，反應速率比過氧醋酸慢，是因為三氯甲基(CCl3)的空間阻礙導致活性較低。(E) 烯類的環氧化反應機構屬於多步驟(multi-steps)反應，並且產生碳陽離子中間體。

27. What product would be obtained by the following reaction?(A)(B)(C)(D)(E) None of the above.

28. Which fragment would you expect to be the base peak in the mass spectrum of limonene?  (A) m/z = 136 (B) m/z = 121 (C) m/z = 93 (D) m/z = 68 (E) m/z = 49

29. What is the major product of the following reaction? ? 

30. Which of the following would correctly describe the respective 13C NMR and 1 H NMR spectra for the indicated atoms for the compound shown below?  (A) Atom 1 would produce a peak at 205 ppm and atom 2 would appear as doublet (B) Atom 1 would produce a peak at 175 ppm and atom 2 would appear as a singlet (C) Atom 1 would produce a peak at 205 ppm and atom 2 would appear as a triplet (D) Atom 1 would produce a peak at 175 ppm and atom 2 would appear as a triplet (E) Atom 1 would produce a peak at 175 ppm and atom 2 would appear as a doublet

31. What is the major product of the following reaction?  

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

33. How would you carry out the following transformation?  (A) 1. (a) NaOH, (b) CH3CH2Br; 2. Na, NH3(l) (B) 1. Na, NH3(l); 2. (a) CH3MgBr, (b) CH3CH2Br (C) 1. (a) NaNH2, (b) CH3CH2Br; 2. H2, Lindlar’s catalyst (D) 1. (a) NaNH2, (b) CH3CH2Br; 2. Na, NH3(l) (E) 1. (a) BuLi, (b) CH3CH2Br; 2. H2, Lindlar’s catalyst

34. What is the best reagent for the following transformation? (A) HF (B) CuF (C) HBF4 (D) Bu4NF (E) F2

105年 - 105 學士後西醫：有機化學#78642

104年 - 104 學士後西醫：有機化學#27032

103年 - 103 學士後西醫：有機化學#27037

102年 - 102 學士後西醫：有機化學#27324

101年 - 101 學士後西醫：有機化學#27197

100年 - 100 學士後西醫：有機化學#35480

98年 - 098 學士後西醫：有機化學#37156

96年 - 96學士後西醫-有機化學 #37201