Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their

1. A. More extensive association of carboxylic acid via van der Waals force of attraction
2. B. Formation of carboxylate ion
3. C. Formation of intramolecular H-bonding
4. D. Formation of intermolecular H-bonding

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