Answer: Carbonyl compounds.
- A Alcohols
- B Ethers
- C Carbonyl compounds
- D Carboxylic acids
Correct answer: C. Carbonyl compounds
Explanation: Carbonyl compounds form coloured 2,4-DNP hydrazones (yellow to orange precipitates).
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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