I. Choose one correct answer for the following questions【單選題】每題 1 分，共計 60 分，答錯 1 題倒扣 0.25 分，倒扣至本大題零分
1. The Keq for the interconversion for the two chair forms of methylcyclohexane at 25 °C is 18. What
3. When pyridine is treated with a mixture of nitric and sulfuric acids, the major product is .(A) 2
5. When (R)-butan-2-ol is treated with TsCl in pyridine, the product formed is .(A) a single enantio
6. What kind of polymer is produced in the following reaction? (A) a polycarbonate (B) poly(acryloni
7. Which of the following reagents should be used to convert hex-3-yne to {E}-hex-3-ene?(A) H2, Pt (
8. SN1 reaction usually proceed with .(A) slightly more inversion than retention at the center under
9. Peptide bonds are .(A) ester linkages (B) imido linkages (C) amide linkages (D) ether linkages (E
13. The structures below are . (A) not isomers (B) conformational isomers (C) structural isomers (D)
14. The Hell-Volhard-Zelinsky reaction involves .(A) the α-bromination of carboxylic acids (B) the α
15. When indole is treated with bromine in dioxane at 0oC, the major organic product is .(A) 2-bromo
16. Which compound has a 1H NMR spectrum consisting of the following peaks: 0.9 (6H, d), 1.0 (3H, t)
17. How many distinct alkene products are possible when the alkyl iodide below undergoes E2 eliminat
18. Which of the following describes the compound below? (A) bridged bicyclic (B) fused bicyclic (C)