51. Which of the reagents listed below would work best in the following reaction? (A) NaBH4 (B) LiAlH4 (C) BH3 -THF
(D) LiAl[(OC(CH3) 3] 3H (E) None of the above
【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. List the following esters in order of decreasing reactivity in the first step of a nucleophilic acyl substitution reaction: (A) 2>3>1>4 (B) 4>1>3>2 (C) 2>4>1>3 (D) 3>1>4>2 (E) 4>2>1>3