Expalin (i) the - OH group attached to aromatic eing in phenols and (ii) alkoxy group in the alkyl aryl ethers are ortho , para directing and activate the aromatic ring towards electrophilic substitution .

Expalin (i) the - OH group attached to aromatic eing in phenols and (i

1.	Expalin (i) the - OH group attached to aromatic eing in phenols and (ii) alkoxy group in the alkyl aryl ethers are ortho , para directing and activate the aromatic ring towards electrophilic substitution .
Answer» Solution :The alkoxy in ALKYL aryl ether and hydroxy group in phenol increases the electron density in the aromatic ring (resonance structure I to V) . Since the electron density increases more at the two - ORTHO and one para position as compared to, m position , therefore , ELECTROPHILIC substitution TAKES place only at ortho and para POSITIONS in phenols and alkyl aryl ethers. The hydroxyl group and alkoxy group attached to benzene ring in phenol and ethers are strongly acidic as compared to - OH group attached to an alkyl group in alcohols . These groups activate the aromatic ring towards electrophilic substitution .