78. How many different β-hydroxyaldehydes and β-hydroxyketones, including constitutional isomers and stereoisomers, are formed upon treatment of a mixture of acetone and acetophenone with base?
(A) 4
(B) 6
(C) 9
(D) 10
(E) 12 .

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

77. Which of the following compounds exhibits the pattern of m/z values: 41, 43, 57, 87, 101, 116? (A) n-butyl n-propyl ether (B) sec-butyl iso-propyl ether (C) 2-heptanol (D) hexanoic acid (E) None of the above

79. Deduce the identity of the compound from the data provided. C5H10O2: IR (cm-1): 3380 (br, s). 1 H-NMR (ppm): 1.30 (s, 3H), 3.50 (t, 1H), 3.64 (d, 2H), 4.38 (d, 2H), 4.52 (d, 2H). 13C-NMR (ppm): 20.72 (q), 40.78 (t), 67.59 (t), 79.74 (t). (A) (2,3-dimethyloxiran-2-yl)methanol (B) 1-(2-methyloxiran-2-yl)ethanol (C) 1-(oxetan-3-yl)ethanol (D) (3-methyloxetan-3-yl)methanol (E) (tetrahydrofuran-2-yl)methanol

80. Predict the major product for the following reaction. (A) I (B) II (C) III (D) IV (E) None of the above

1 運輸系統與運輸業經營的首要目標為： (A)便利 (B)經濟 (C)安全 (D)準點

2 運輸事業供應社會公眾勞務，其所收取之費率，即單位勞務之售票，稱為： (A)基本運價 (B)運費 (C)票價 (D)運價

3 下列何者為旅客使用私人運輸的隱含成本？ (A)購車費用 (B)保險支出 (C)牌照稅 (D)時間價值

4 下列何者為衡量運輸價格與使用量間的函數關係？ (A)均衡點 (B)運量 (C)運輸需求 (D)效用