Question

What is the major product of the following reaction?

Answer 1

This is hydrohalogenation of an alkyne.

This addition reaction exhibits Markovnikov regioselectivity, so each bromide would add to the more substituted carbon.

It's not `("a").` because there is excess reagent, it's not `("c").` because of the preceding fact.

`("d").` is a nonsense answer.

Hence, the answer is `("b").`