In the addition of HBr to 1-butyne,the electrophile in the first step of the mechanism is
A)the Csp-H1s bond of 1-butyne.
B)the C-C triple bond of 1-butyne.
C)the H atom in HBr.
D)the Br ion.

Question

Quizplus · Accepted Answer

In the addition of HBr to 1-butyne, the first step involves the protonation of the alkyne. The electrophile in this step is the H atom in HBr, which attacks the electron-rich π-bond of the alkyne.

In the Addition of HBr to 1-Butyne,the Electrophile in the First