Identify the IUPAC name of the major product 'X' formed in the given chemical reaction.

Step-by-step solution

The reaction of an unsymmetrical alkene with HBr in the presence of benzoyl peroxide proceeds via a free radical addition mechanism, commonly known as the anti-Markovnikov addition or peroxide effect. The initial step is the homolytic cleavage of the peroxide to form alkoxy radicals, which then abstract a hydrogen atom from HBr to generate a bromine radical ( Br^ ). The bromine radical adds to the alkene double bond such that it generates the more stable carbon radical intermediate. The substrate is 3-methylcyclohe