問題詳情
37. In the addition of HBr to alkynes in the absence of peroxides, which of the following species is believed to be anintermediate?
(A) Vinyl anion
(B) Vinyl cation
(C) Vinyl radical
(D) Carbene
(E) Bromonium ion
參考答案
答案：B
難度：適中0.5
統計：A(0),B(1),C(1),D(0),E(0)