Draw the major organic product X for the below reaction.

The reaction as shown involves the attack of a nucleophile on an electrophile.
The reaction as shown involves the attack of a nucleophile on an electrophile. Recall that a nucleophile is a specie that attacks a positive center while an electrophile is a specie that attacks a negative center.
The attack of a nucleophile on a electrophile are very important in chemistry as they are responsible for the reaction of single bonds between the species that are involved as we can see in the reaction as shown in the image attached to this answer given here in the reaction.
In this case, the alkene acts as the nucleophile and attacks the phenyl ethanol as the -OH group leaves creating carbocation. The major product of the reaction is the structure that has been shown in the image attached to this answer. The minor product of the reaction is HBr.
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