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98年 - 098 學士後西醫：有機化學#37156

科目：學士後西醫-有機化學 | 年份：98年 | 選擇題數：80 | 申論題數：0

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所屬科目：學士後西醫-有機化學

選擇題 (80)

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，倒扣至本大題零分為止，未作答，不給分亦不扣分。

 1. What is the carbon nucleophile which attacks molecular bromine in the acid-catalyzed α-bromination of a ketone? (A) an enol (B) a Grignard reagent (C) an acetylide (D) a carbocation (E) an enolate
2. What species is attacked by the alcohol's hydroxyl in the mechanism of the Swern oxidation? (A) dimethylchlorosulfonium ion (B) dimethylsulfoxide (C) oxalyl chloride (D) oxalinium ion (E) aldehyde or ketone
3. When pyridine is treated with a mixture of nitric and sulfuric acids, the major product is . (A) 2-nitropyridine (B) 3-nitropyridine (C) 4-nitropyridine (D) 3-aminopyridine (E) 4-aminopyridine
4. What is the major organic product of the following reaction?
5. When (R)-butan-2-ol is treated with TsCl in pyridine, the product formed is . (A) a single enantiomer (B) a racemic mixture (C) a mixture of diastereomers (D) an achiral compound (E) none of the above
6. What kind of polymer is produced in the following reaction?
 (A) a polycarbonate (B) poly(acrylonitrile) (C) a polyester (D) polyurethane (E) a synthetic rubber
7. Which of the following reagents should be used to convert hex-3-yne to {E}-hex-3-ene? (A) H2, Pt (B) Na, NH3 (C) H2, Lindlar's catalyst (D) H2SO4, H2O (E) HgSO4, H2O
8. SN1 reaction usually proceed with . (A) slightly more inversion than retention at the center undergoing substitution (B) slightly more retention then inversion at the center undergoing substitution (C) equal amounts of inversion and retention at the center undergoing substitution (D) complete inversion at the center undergoing substitution (E) complete retention at the center undergoing substitution
9. Peptide bonds are . (A) ester linkages (B) imido linkages (C) amide linkages (D) ether linkages (E) disulfide linkages
10. What is the major product of the following reaction?
11. What compound is produced when (CH3)2CHCH2Br is subjected to the following sequence of steps: 1. Mg, Et2O, 2. CO2, 3. H3O+ ? (A) 2-methylpropanoic acid (B) 3-methylpropanoic acid (C) 2-methylbutanoic acid (D) 3-methylbutanoic acid (E) 2-methylhexanoic acid
12. Which of the following alcohols will react most rapidly with the Lucas reagent (HCl, ZnCl2)? 
13. The structures below are . 
(A) not isomers (B) conformational isomers (C) structural isomers (D) cis-trans isomers (E) both B and D
14. The Hell-Volhard-Zelinsky reaction involves . (A) the α-bromination of carboxylic acids (B) the α-bromination of ketones (C) the bromination of alcohols (D) the oxidation of aldehydes to acids (E) none of the above
15. When indole is treated with bromine in dioxane at 0o C, the major organic product is . (A) 2-bromoindole (B) 3-bromoindole (C) 4-bromoindole (D) 5-bromoindole (E) 6-bromoindole
16. Which compound has a 1 H NMR spectrum consisting of the following peaks: 0.9 (6H, d), 1.0 (3H, t), 2.2 (2H, q), and 4.0 (1H, septet)? 
17. How many distinct alkene products are possible when the alkyl iodide below undergoes E2 elimination? 
 (A) 1 (B) 2 (C) 3 (D) 4 (E) 5
18. Which of the following describes the compound below? 
 (A) bridged bicyclic (B) fused bicyclic (C) spiro bicyclic (D) bridged tricyclic (E) fused tricyclic
19. What method will produce the transformation? 
 (A) Li / ND3 (B) (sia)2BD then H2O (C) CH3CH2MgBr then D3O+ (D) (sia)2BD then D2O (E) LiAlD4 then D2O
20. Energy is __________ when bonds are formed and is __________ when bonds are broken; therefore, bond dissociation energies are always __________. (A) released / consumed / exothermic (B) released / consumed / endothermic (C) consumed / released / exothermic (D) consumed / released / endothermic (E) consumed / released / isothermic
21. Which of the following are correct Lewis structures, including formal charges, for nitric acid, HNO3? 
 (A) A only (B) B only (C) C only (D) both B and C (E) A, B, and C
22. Which of the following alkyl chlorides is least likely to undergo rearrangement during a solvolysis reaction? (A) cis-1-chloro-2-ethylcyclohexane (B) trans-1-chloro-2-ethylcyclohexane (C) 2-chloro-4-methylpentane (D) 2-chloro-3-methylpentane (E) 2-chloro-2-methylpentane
23. Which of the following descriptions of the nucleoside uridine does not apply to the structure of the molecule? (A) The uracil base is directly bonded to the 1' position of ribofuranose in the α position. (B) The ribofuranose moiety is found in only the D configuration. (C) Nitrogen, at position 1 in the uracil base, is directly bonded to the ribofuranose moiety. (D) The 5' OH group is replaced with phosphate(s) in the nucleotide structure. (E) none of the above
24. Which of the following is correct in order of decreasing nucleophilicity toward methyl iodide in methanol? (A) CH3O- > CH3S- > CN- > Br- (B) CH3O- > CN- > CH3S- > Br- (C) CN- > CH3O- > CH3S- > Br- (D) CH3S- > Br- > CH3O- > CN- (E) CH3S- > CN- > CH3O- > Br-
25. Which of the following compounds will undergo SN2 reaction most readily? (A) (CH3)3CCH2I (B) (CH3)3CCl (C) (CH3)2CHI (D) (CH3)2CHCH2CH2CH2I (E) (CH3)2CHCH2CH2CH2Cl
26. Which of the following carbonyl compounds can be reduced by H2/Raney Ni? (A) acetic acid (B) ethyl acetate (C) acetyl chloride (D) acetamide (E) N-methyl acetamide
27. Which of the following is the rate-determining step for the monobromination of cyclohexane?
 (A) Step I (B) Step II (C) Step III (D) Step IV (E) Step V
28. What is the major organic product of the following reaction? 
29. Which are ylides? 
 (A) only I (B) only II (C) I and II (D) II and III (E) III and IV
30. Which of the following chemical reactions could be used to distinguish between a polyunsaturated vegetable oil and a petroleum oil containing a mixture of saturated and unsaturated hydrocarbons? (A) addition of bromine in carbon tetrachloride (B) ozonolysis (C) hydrogenation (D) lipidification (E) saponification
31. When an alkene is subjected to treatment with Hg(OAc)2 in alcohol followed by reaction with NaBH4, what new class of compound is formed? (A) ether (B) epoxide (C) alkane (D) syn diol (E) alkyne
32. Distillation of mixtures of ethanol and water cannot increase the ethanol content of the mixture above 95% because this solution boils at a lower temperature than either pure ethanol or pure water. The term which describes this lower boiling mixture is _____. (A) miscible (B) azeotrope (C) isoniazide (D) epimerization (E) none of these
33. The methyl ester of a carboxylic acid can be synthesized by directly using . (A) SOCl2 (B) PCl5 (C) CH2N2 (D) C2O2Cl2 (E) CH3NH2
34. What is the major product of the following reaction? 
35. Which of the following cycloalkenes would be expected to be stable?
 (A) 1 and 2 (B) 2 and 3 (C) 2 (D) 1 and 3 (E) none are stable
36. Which of the following structures is the most important contributor to the resonance hybrid formed when anisole undergoes ortho-bromination?
37. Which series of reactions would best facilitate the following conversion?
 (A) 1. KMnO4 (aq), 2. Hg(OAc)2 (aq), 3. NaBH4/OH- (B) 1. NaBH4, 2. H3PO4/△ (C) 1. CH3MgBr, 2. H3O+ (D) 1. NaBH4 , 2. HBr(g), 3. Mg/ether, 4. H3O+ (E) 1. Raney nickel, 2. CH3MgBr, 3. H3O+
38. A pure sample of (S)-phenylalanine has a specific rotation of +70o . A mixture of the two enantiomers of phenylalanine gives a specific rotation of -7.0o . What are the percentages of the S and R enantiomers in the mixture? (A) 75 % S, 25 % R (B) 65 % S, 35 % R (C) 55 % S, 45 % R (D) 45 % S, 55 % R (E) 35 % S, 65 % R
39. Which of the following compounds would you expect to show IR absorptions at 1735, 2100, 3300 cm-1? 
40. Which of the following compounds would most likely be used in the preparation of isobutylbenzene from benzene? 
(A) (CH3)2CHCOCl 
(B) (CH3)2CHCH2Cl 
(C) (CH3)2CHCH2Br 
 (D) CH3CH2CH2CH2Cl 
(E) CH3CH2CH2COCl
41. What is the product of the following reaction? 
 (A) acetaldehyde (B) acetic acid (C) racemic (2R,3R) and (2S,3S)-2,3-butanediol (D) meso-2,3-butanediol (E) cis-2,3-epoxybutane
42. Provide the structure of the major organic product in the following reaction:
43. Which of the following describes the most stable conformation of trans-1-isopropyl-3-methylcyclohexane? (A) Both groups are equatorial. (B) Both groups are axial. (C) The isopropyl group is equatorial and the methyl group is axial. (D) The isopropyl group is axial and the methyl group is equatorial. (E) none of the above
44. Which of the following compounds will react most rapidly with HCl?(A) 5-methyl-1-hexene(B) 4-methyl-1-hexene(C) ( E )5-methyl-2-hexene(D) ( E )-2-methyl-3-hexene(E) 2-methyl-2-hexene
45. Which of the labeled H atoms (1-5) in the following molecule would be predicted to be the most acidic? 
 (A) 1 (B) 2 (C) 3 (D) 4 (E) 5
46. What is the major product of the following reaction? 
47. Which of the following compounds exhibits the pattern of m/z values shown below? 41, 43, 57, 87, 101, 116 (A) n-propylbromide (B) isopropyl bromide (C) 2-hexanol (D) 2-butanone (E) sec-butyl isopropyl ether
48. Which of the following statements correctly pertains to a pair of enantiomers? (A) They rotate the plane of polarized light by exactly the same amounts and in opposite directions. (B) They rotate the plane of polarized light by differing amounts and in opposite directions. (C) They rotate the plane of polarized light by differing amounts and in the same directions. (D) They have the same specific rotation, but they have different melting points. (E) They have the same melting points, but they have different boiling points.
49. Which of the following compounds is the most reactive toward electrophilic aromatic substitution?
50. What is the product of the following reaction? 
51. What is the major product of the following reaction? 
52. Which of the following compounds has the most signals in the noise-decoupled 13C NMR spectrum? (A) o-dibromobenzene (B) m-dibromobenzene (C) p-dibromobenzene (D) 1,3,5-tribromobenzene (E) 1,2,3,4-tetrabromobenzene
53. Identify the aromatic compounds. 
 (A) I and II (B) II and III (C) I and III (D) III and IV (E) I, III and IV
54. Which of the following compounds has the highest melting point? (A) benzene (B) toluene (C) o-dichlorobenzene (D) m-dichlorobenzene (E) p-dichlorobenzene
55. Provide the structure of the major organic product in the following reaction. 
(A)(B)(C)(D)(E) none of these
56. What is the major product of the following reaction? 
57. A sample of compound X is subjected to elemental analysis and the following percentages by weight are found: 39.97% C, 6.73% H, and 53.30% O. The molecular weight of X is 90. What is the empirical formula of X? (A) C6H8O (B) C2H4O2 (C) C4H10O2 (D) C3H6O3 (E) CH2O
58. Which of the following conditions will drive the equilibrium of the Fischer esterification towards ester formation? (A) addition of water (B) removal of water as it is formed (C) addition of an inorganic acid as a catalyst (D) addition of alcohol (E) both B and D
59. The Wittig reaction involves . (A) formation of carboxylic acids (B) formation of alkenes (C) formation of α,β-unsaturated carboxylic acids (D) formation of β-ketoesters (E) formation of alcohols
60. The protons marked Ha and Hb in the molecule below are ______. 
 (A) chemically equivalent (B) enantiotopic (C) diastereotopic (D) endotopic (E) none of the above II. Choose one correct answer for the following questions 
【單選題】每題 2 分，共計 40 分，答錯 1 題倒扣 0.5 分，倒扣至本大題零分為止，未作答，不給分亦不扣分。

61. Provide the structure of the major organic product in the following reaction.
62. Provide the structure of the major organic product in the following reaction.
63. Provide the structure of the major organic product in the following reaction.
64. Provide the structure of the major organic product in the following reaction. 
65. Provide the structure of the major organic product in the reaction below. 
66. Provide the structure of the major organic product in the following reaction.
67. What is the major product of the following reaction? 
68. What is the major organic product resulted from tetrahydrofuran being reacted with excess HBr? (A) 1,2-dibromobutane (B) 1,3-dibromobutane (C) 1,4-dibromobutane (D) 4-bromobutan-1-ol (E) 3-bromobutan-1-ol
69. Provide the structure of the major organic product in the following reaction.
70. Identify the major product of the reaction below.
71. Provide the structure of the major organic product in the following reaction.
72. Provide the structure of the major organic product in the following reaction. 
73. Arrange the following in order of increasing acidity (least acidic first). 
 (A) B < C < A < D < E (B) C < A < B < E < D (C) C < A < E < B < D (D) E < C < A < B < D (E) none of these
74. Based on the structure shown below, choose the stereoisomer having a configuration of (1R,3S,4S) in a perspective structure. 
(A)(B)(C)(D)(E) none of the above
75. Deduce the identity of the compound from the data provided. C8H13Br, 1 H NMR δ(splitting, integral): 3.5 (t, 2H), 1.8 (t, 2H), 0.9 (s, 9H); 13C NMR: 6 signals. (A) 5-bromo-2,2-dimethylhex-3-yne (B) 6-bromo-4,4-dimethylhex-1-yne (C) 3-bromo-1,2-dimethylcyclohexene (D) 4-bromo-1,2,4-trimethylcyclopentene (E) 1-bromo-5,5-dimethylhex-3-yne CO2Me H H O O CH3SOCH2 - Na+ DMSO
76. Provide the structure of the major organic product in the following reaction.
(A)(B)(C)(D)(E) none of these

77. Which of the following reactions will result in the formation of a secondary alcohol(s) in good yield? (A)(B)(C)(D)(E)both（A）and（D）
78. Arrange the following reactions in order for preparing 1,4-diaminobutane from cyclohexene. I. NH3 II. KMnO4, H3O+ III. Br2, NaOH/H2O IV. SOCl2 (A) I → IV → II → III (B) II → III → I → IV (C) IV → II → III → I (D) II → IV → I → III (E) none of these
79. Provide the structure of the major organic product in the following reaction.
80. Provide the structure of the major organic product in the following reaction.

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