未分類 41 - 題庫堂

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5. What is the major product of the following reaction?

38. A pure sample of (S)-phenylalanine has a specific rotation of +70o. A mixture of the two enantio

39. Which of the following compounds would you expect to show IR absorptions at 1735, 2100, 3300 cm-

6. Which sequence of reagents works best to convert 3-hexene to 3-hexyne?(A) 1. HCl 2. NaNH2 (B) 1.

7. Which of the following technique(s) can readily distinguish between: (A) NMR (B) IR (C) MS (D) A

32.下列反應之主要有機產物為：

40. Which of the following compounds would most likely be used in the preparation of isobutylbenzene

41. What is the product of the following reaction? (A) acetaldehyde (B) acetic acid (C) racemic (2R,

8. What is the major product of the following reaction?

33.Isoprene ,它的 IUPAC 命名是：

42. Provide the structure of the major organic product in the following reaction:

9. What is the major product of the following reaction?

34.某烷類其结構如下，IUPAC的命名為：(A) 2，3，4-trimethylpentane(B)1 2,3-trimethylbutane(C) 2，3-dimethylpentane(D)2-

35.二構形異構物結構如下，其相關的穩定是 (A) A較B穩定(B) B較A穩定(C) A和B —樣穩定，^(D) A和B穩定度不同，但無法由此结構判斷

43. Which of the following describes the most stable conformation of trans-1-isopropyl-3-methylcyclo

44. Which of the following compounds will react most rapidly with HCl?(A) 5-methyl-1-hexene (B) 4-me

45. Which of the labeled H atoms (1-5) in the following molecule would be predicted to be the most a

10. What is the major product from the following rearrangement?

36.下式反應的主產物為：

46. What is the major product of the following reaction?

11. At what position of the pyridine ring in the coenzyme below will oxidation-reduction reaction ta

37.下列稀類化合物中，何者是E-configuration?

38.下列含氮化合物中，何者鹼性最小？ (A)I(B) II (C) III (D)IV

47. Which of the following compounds exhibits the pattern of m/z values shown below? 41, 43, 57, 87,

48. Which of the following statements correctly pertains to a pair of enantiomers?(A) They rotate th

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