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Reaction of phenol with chloroform in presence of dilute sodium hydroxide finally introduces which one of the following functional group?

1. -CH2Cl
2. -COOH
3. -CHCl2
4. -CHO

Correct answer: -CHO

Solution

Phenol reacts with chloroform in the presence of dilute sodium hydroxide to form salicylaldehyde, introducing the -CHO (aldehyde) group. This is known as the Reimer-Tiemann reaction.

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