NEET 2018 · ChemistryAcid acidityPrevious Year Question
Carboxylic acids have higher boiling points than aldehydes, ketones and even alcohols of comparable molecular mass. It is due to their:
Answer: (D) (D) Formation of intermolecular H-bonding. \textbf{Answer:} (D) Formation of intermolecular H-bonding \textbf{Solution:} Carboxylic acids form extensive intermolecular hydrogen bonds, existing largely as cyclic dimers in the liquid and vapour states.
- A.(A) More extensive association of carboxylic acid via van der Waals force of attraction
- B.(B) Formation of carboxylate ion
- C.(C) Formation of intramolecular H-bonding
- D.(D) Formation of intermolecular H-bonding✓
Correct Answer
(D) (D) Formation of intermolecular H-bonding
Solution & Explanation
\textbf{Answer:} (D) Formation of intermolecular H-bonding \textbf{Solution:} Carboxylic acids form extensive intermolecular hydrogen bonds, existing largely as cyclic dimers in the liquid and vapour states. This strong intermolecular association raises their boiling points above those of aldehydes, ketones and even alcohols of comparable molecular mass.
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