The incorporation of HBr to alkene leads to the formation of alkyl bromide. A carbocation intermediate leads to the product in this reaction.

Alkene combines with HBr in the presence of conditions like sunlight, heat, or peroxides resulting in the formation of alkyl bromides. This reaction proceeds through a radical intermediate.

a. The reaction of compound a with HBr results in the formation of 2-bromohexane. The reaction of compound a with HBr and peroxide leads to the formation of 1-bromohexane.

The addition of HBr in the absence of light takes place via the carbocation intermediate. The addition of HBr in the presence of light takes place via the radical intermediate. The reactions can be given as:

Reaction of compound a with HBr alone and in the presence of HBr and peroxide

b.The reaction of compound b with HBr leads to the formation of 1-bromo-1-methylcyclohexane. The reaction of compound b with HBr and peroxide leads to the formation of 1-bromo-2-methylcyclohexane. The reactions can be given as:

Reaction of compound b with HBr alone and in the presence of HBr and peroxide

c. The reaction of compound c with HBr alone or in the presence of HBr and peroxide leads to the formation of 2-bromohexane and 3-bromohexane. The reaction can be given as:

Reaction of compound c with HBr alone and in the presence of HBr and peroxide