(e)The hydroxyl group, as the most activating substituent, controls the orientation of elec-trophilic aromatic substitution. Bromination takes place ortho to the hydroxyl group.(f)Oxidation of hydroquinone derivatives (p-dihydroxybenzenes) with Cr(VI) reagents is amethod for preparing quinones.(g)Aryl esters undergo a reaction known as the Fries rearrangementon being treated withaluminum chloride, which converts them to acyl phenols. Acylation takes place para to thehydroxyl in this case.(h)Nucleophilic aromatic substitution takes place to yield a diaryl ether. The nucleophile is the
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