Major product of reaction :

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(D) The reaction of $p$-cresol ($4$-methylphenol) with $Br_2$ in the presence of $FeCl_3$ (a Lewis acid catalyst) is an electrophilic aromatic substit

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(D) The reaction of $p$-cresol ($4$-methylphenol) with $Br_2$ in the presence of $FeCl_3$ (a Lewis acid catalyst) is an electrophilic aromatic substitution reaction.Since the $-OH$ group is a strong activating group and ortho/para directing,and the para position is already occupied by a $-CH_3$ group,the electrophile $(Br^+)$ will attack the ortho position relative to the $-OH$ group.Therefore,the major product is $2$-bromo-$4$-methylphenol.

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