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Statement-I: p-Hydroxybenzoic acid has a lower boiling point than o-hydroxybenzoic acid. Statement-II: o-Hydroxybenzoic acid forms intramolecular hydrogen bonds. Choose the correct option.
- Statement-I is True, Statement-II is True; Statement-II is a correct explanation for Statement-I
- Statement-I is True, Statement-II is True; Statement-II is NOT a correct explanation for Statement-I
- Statement-I is True, Statement-II is False.
- Statement-I is False, Statement-II is True.
Correct answer: Statement-I is True, Statement-II is True; Statement-II is a correct explanation for Statement-I
Solution
In o-hydroxybenzoic acid (salicylic acid), the OH and COOH groups are close enough to form an intramolecular hydrogen bond, which reduces intermolecular H-bonding and lowers boiling point. p-Hydroxybenzoic acid lacks intramolecular H-bonding and forms extensive intermolecular H-bonds, raising its boiling point. Statement-II directly explains Statement-I.
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