未分類

50.關於cis-l-rerf-butyl-4-chlorocycloliexane 的敘述，何者正確？ (A)Conformation II 比 1 不安定(B)Conformation II與I有

34. What is the systemic name of the following compound? (A) 1-Azabicyclo[2,2,1]heptane (B) 2-Azabic

66. Provide the structure of the major organic product in the following reaction.

35. What is the name of the following reaction? (A) Wittig reaction (B) Michael reaction (C) Dieckma

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

36. Which of the following lists the correct order of reactivity of the substrates in electrophilic

37. In the addition of HBr to alkynes in the absence of peroxides, which of the following species is

38. Which of the following statements about propene is correct?(A) All of the hydrogen atoms are in

39. The t-butoxycarbonyl group (Boc) is a widely used protecting group for primary amine and seconda

40. Predict the product of the following reaction: (E) None of the above

68. What is the major organic product resulted from tetrahydrofuran being reacted with excess HBr?(A

69. Provide the structure of the major organic product in the following reaction.

41. The best method for preparation nonhalogenated cyclopropanes is by a process called the ________

42. In the following structures, the general structure of sulfone is _________. (A) A (B) B (C) C (

70. Identify the major product of the reaction below.

43. What is the major organic product of the following sequence of reactions?

71. Provide the structure of the major organic product in the following reaction.

44. Choose the best reagent for carrying out the following conversion. (A) 1. PhMgBr, ether; 2. H3O+

72. Provide the structure of the major organic product in the following reaction.

45. From the structures (I-IV) giving below which one belongs to nucleotide. (A) I (B) II (C) III (D

73. Arrange the following in order of increasing acidity (least acidic first). (A) B < C < A &

46. What fragment ion (m/z) is produced from McLafferty rearrangement of 5-methyl-2-hexanone in EI-M

47. Select the most reasonable formula for the compounds with the following mass spectral data: M+ a

48. If a compound has the –OH, –OCH3, and –CHO groups all attached to a single benzene ring, the IUP

49. Which one of the following would NOT be a suitable solvent for Grignard reagents?(A) Diethyl eth

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