Question

Explain why 2-bromomethylpropane is the major product of a reaction while only relatively small amounts of 1-bromomethylpropane are produced?

Answer 1

In your comment you're referring to hydrohalogenation of an alkene.

This reaction has Markovnikov regioselectivity. Thus, the more substituted carbon will be attacked by the bromide nucleophile due to the stability of the carbocation intermediate.

This will produce a racemic mixture of 2-bromomethylproane.