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33. Which of these diaxial conformations has the highest energy?

(A) I
(B) II
(C) III
(D) IV

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統計： 尚無統計資料

其他試題

29. Which are acid-base reactions according to Lewis theory but not according to the Brønsted-Lowry theory?(A) I, II (B) III, IV (C) I, III, IV (D) I, II, III, IV

30. Which acid is the most acidic?(A)I (B) II (C) III (D) IV

31. Which is the IUPAC name for the following cycloalkane? (A) 2,4-dimethyl-1-ethylcyclopentane(B) 1,3-dimethyl-5-ethylcyclopentane (C) 1-ethyl-2,4-dimethylcyclopentane(D) 1-ethyl-3,5-dimethylcyclopentane

32. Which conformation of pentane is most stable?(A) I(B) II(C) III(D) IV

34. Which structure is Z-2-bromo-3-methyl-2-pentene? (A) I(B) II(C) III(D) IV

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

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

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

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.

39. What is the major product of the following reaction? (A) (B) (C) (D)

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