In the addition of HBr to 1-butyne, the electrophile in the first step of the mechanism is:

Question

Quizplus · Accepted Answer

HBr is a polar molecule with a partially positive H atom and a partially negative Br atom. In the addition of HBr to 1-butyne, the partially positive H atom of HBr acts as an electrophile and adds to the π-bond of the triple bond, forming a carbocation intermediate. Therefore, option C, the H atom in HBr, is the correct choice for the electrophile in the first step of the mechanism.

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