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109年 - 109 亞洲大學_學士後招生考試_獸醫學系:化學(含普通化學、有機化學)#101267
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32. Which conformation of pentane is most stable?
(A) I
(B) II
(C) III
(D) IV
答案:
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統計:
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相關試題
33. Which of these diaxial conformations has the highest energy? (A) I (B) II (C) III (D) IV
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34. Which structure is Z-2-bromo-3-methyl-2-pentene? (A) I (B) II (C) III (D) IV
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35. Arrange these carbocations in order of increasing stability (least to most). (A) I, II, III (B) I, III, II (C) II, I, III (D) III, II, I
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36. Which of the following alkenes is the major product when 2-bromo-2-methylpentane is treated with sodium ethoxide in ethanol? (A) 2-methylpent-1-ene (B) 2-methylpent-2-ene (C) ( E )-4-methylpent-2-ene (D) (Z)-4-methylpent-2-ene
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37. Which of the following alkenes is the major product when 2-bromo-2-methylpentane is treated with potassium tert-butoxide in tert-butanol? (A) 2-methylpent-1-ene (B) 2-methylpent-2-ene (C) ( E )-4-methylpent-2-ene (D) (Z)-4-methylpent-2-ene
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38. Which of the following statements applies to the E2 mechanism? (A) It occurs with inversion of stereochemistry. (B) It occurs with racemization of stereochemistry. (C) It proceeds through the more stable carbocation intermediate. (D) The C-H and C-X bonds that break must be anti.
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39. What is the major product of the following reaction? (A) (B) (C) (D)
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40. Provide the reagents necessary to complete the following transformation. (A) 1. BH3∙THF 2. H2O2, HO- (B) H2O, H2SO4 (C) OsO4, H2O2 (D) CH3CO3H
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41. Which of the following reagents will convert 1 mole of 3-methylpent-1-yne into 3-methylpentane? (A) 1 mole of Br2 in CCl4 (B) 2 moles of Cl2 in CCl4 (C) 2 moles of HCl (D) 2 moles H2, Ni and heat
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42. Which of the following reagents should be used to convert hex-3-yne to (Z)-hex-3-ene (A) H2, Pt (B) Na, NH3 (C) H2, Lindlar's catalyst (D) H2SO4, H2O
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