73. Which of the following represents the HOMO of pentadienyl anion? 

26. Which of the following represents the HOMO for the conjugated system in Leukotriene B4?  (A) (B) (C) (D) (E)

12. Chorismate mutase is an enzyme that catalyzes a pericyclic reaction that forms prephenate. What kind of a pericyclic reaction does chorismate mutase catalyze? (A) an ene reaction (B) an electrocyclic reaction (C) a sigmatropic rearrangement (D) a cycloaddition reaction (E) None of the above

76. Provide the structure of the major organic product in the following reaction.(A)(B)(C)(D)(E) none of these

25. 進行克萊森重排(Claisen rearrangement)反應的產物為 (A) (B) (C) (D)

2. 順式-3,4-二甲基環丁烯加熱會進行開環反應而產生下列何者產物？(A) (B) (C) (D)

45. 下列反應生成主要產物結構為何？ (A) (B) (C) (D)

16. Which of the following orbital represents the HOMO of 1,3-butadiene in ground state? 

74. Predict the major product for the following reaction sequence. (A) I (B) II (C) III (D) IV (E) V

75. The H-bonds formed in the tertiary structure of proteins can be differentiated from those formed in secondary structures. What is the major distinguishing factor? (A) The H-bonds in 3° structures are significantly stronger than those found in 2° structures. (B) The H-bonds in 3° structures are more random than those formed in 2° structures.(C) The H-bonds in 3° structures are formed by predictable interactions among the peptide backbone α-amine and α-carboxylate groups. (D) The H-bonds in 3° structures are formed by interactions involving the side chain R-groups. (E) Both B and D are correct.

76. Predict the outcome of the following sequence of reactions.  (A) I (B) II (C) III (D) IV (E) V

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