Answer:

(b) 1 –Phenyl -3- bromopropane

Explanation:

The major product obtained on the reaction of 3-Phenyl propene with HBr in the presence of an organic peroxide is (b) 1-Phenyl-3-bromopropane.

When 3-Phenyl propene reacts with HBr in the presence of an organic peroxide, it undergoes an addition reaction. The organic peroxide acts as a radical initiator, generating bromine radicals that can add to the double bond of 3-Phenyl propene.

The addition of the HBr molecule occurs at the more substituted carbon of the double bond, following Markovnikov's rule. This means that the bromine atom attaches to the carbon that already has the higher number of hydrogen atoms.

In the case of 3-Phenyl propene, the phenyl group is attached to the carbon with the fewer hydrogen atoms. Therefore, the bromine atom will attach to the carbon that does not have the phenyl group. This results in the formation of 1-Phenyl-3-bromopropane as the major product.

In summary, when 3-Phenyl propene reacts with HBr in the presence of an organic peroxide, the major product obtained is (b) 1-Phenyl-3-bromopropane.

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The major product obtained when 3-phenylpropene reacts with HBr in the presence of an organic peroxide is:

(d) 3-Phenyl-2-bromopropane

This reaction involves the addition of HBr across the double bond of 3-phenylpropene, resulting in the formation of 3-phenyl-2-bromopropane.