Answer: form hydrogen-bonded dimers.
- A form hydrogen-bonded dimers
- B are highly ionic solids
- C have very high molar mass
- D contain a carbonyl group
Correct answer: A. form hydrogen-bonded dimers
Explanation: Two molecules pair through two O-H...O hydrogen bonds to form a dimer, so a larger effective mass raises the boiling point.
Curved arrows show the nucleophile attacking the carbonyl carbon while the C=O pi electrons move onto oxygen, giving a tetrahedral alkoxide intermediate.
Concept context
Aldehydes, ketones, carboxylic acids, and their derivatives (esters, amides, acid chlorides). Key reactions include nucleophilic addition, Aldol condensation, Cannizzaro, and Claisen. Very heavily tested in JEE and NEET.
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