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  4. Reaction of phenol with chloroform/sodium hydroxide to give o-hydroxy benzaldehyde involves the formation of

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Q. Reaction of phenol with chloroform/sodium hydroxide to give o-hydroxy benzaldehyde involves the formation of

Alcohols Phenols and Ethers

Solution:

This is Reimer-Tiemann reaction where the electrophile is dichlorocarbene $(: CCl_{2})$ generated from chloroform by the action of a base
$^{-}OH+CHCl_{3} \rightleftharpoons HOH+:CCl^{-}_{3} \to Cl-+: CCl_{2}$