NEET 2018 · ChemistryIonic characterPrevious Year Question
Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. This is due to their:
Answer: (D) Formation of intermolecular H-bonding. \textbf{Answer:} (D) Formation of intermolecular H-bonding \textbf{Solution:} Carboxylic acid molecules associate through intermolecular hydrogen bonding (forming dimers), which requires extra energy to break, raising their boiling points above those of comparable aldehydes, ketones and alcohols.
- A.More extensive association of carboxylic acid via van der Waals force of attraction
- B.Formation of carboxylate ion
- C.Formation of intramolecular H-bonding
- D.Formation of intermolecular H-bonding✓
Correct Answer
(D) Formation of intermolecular H-bonding
Solution & Explanation
\textbf{Answer:} (D) Formation of intermolecular H-bonding \textbf{Solution:} Carboxylic acid molecules associate through intermolecular hydrogen bonding (forming dimers), which requires extra energy to break, raising their boiling points above those of comparable aldehydes, ketones and alcohols.
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