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When phenol is treated with sodium hydroxide followed by carbon dioxide, which major product is formed?

1. Salicylaldehyde
2. Salicylic acid
3. Phthalic acid
4. Benzoic acid

Correct answer: Salicylic acid

Solution

The reaction of phenol with sodium hydroxide generates the phenoxide ion, which can then undergo a carboxylation reaction with carbon dioxide to form salicylic acid, a compound characterized by the presence of both a hydroxyl and a carboxylic acid group.

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