Question

Which of the following options gives the correct structure of the product obtained by complete reaction of the alkyne with HBr?

a) HC≡CH + HBr → HC≡C-Br + H₂
b) HC≡CH + HC≡CH + HBr → HC≡C-C≡C + H₂
c) CH≡CH + CH≡CH + HBr → CH≡C-CH≡C + H₂
d) HC≡CH + HC≡CH + BrH → HC≡C-CH≡C + H₂

Answer 1

The correct product obtained by the reaction of ethyne with HBr is vinyl bromide, which is represented as HC≣C-Br + H₂.

Step-by-step explanation:

The reaction of an alkyne with HBr (hydrogen bromide) involves the addition of a hydrogen atom and a bromine atom across the triple bond. The correct structure of the product obtained by the complete reaction of ethyne (HC≣CH) with HBr is:

a) HC≣CH + HBr → HC≣C-Br + H₂

This indicates that hydrogen adds to one carbon atom and bromine adds to the other carbon atom of the alkyne, resulting in a vinyl bromide. None of the other options correctly represent the addition of HBr to an alkyne.