51. Which of the following reagents can be used to cleave a tert-butoxycarbonyl (Boc) protecting gro
52. The reaction shown below would be expected to produce as major products which of the following c
53. What is the best method for the preparation of m-dibromobenzene from benzene?(A) 1). HNO3/H2SO4;
54. Which is the best method for the synthesis of tert-butyl methyl ether?(A) CH3ONa + (CH3)3CBr →(B
55. Which of the following will result in removal of a benzyl ester protecting group?(A) acid hydrol
56. Which of the following ketones will give a positive iodoform test?(A) 3-heptanone (B) 3-hexanone
57. Which of the following compounds will display a singlet, a triplet and a quartet in the 1H NMR s
58. Examining the infrared spectrum of a compound allows us to:(A) determine the types of functional
59. Which of these is the least reactive type of organometallic compound?(A) RK (B) R2Hg (C) RLi (D)
【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. A student measured the optical activit
62. Which of the following series of synthetic steps could be used to carry out the transformation s
65. How many positive and negative peaks appear in the DEPT-135 and in the DEPT-90 spectrum of 2-met