Which reagent gives an orange or yellow precipitate with both aldehydes and ketones?
Correct answer A. 2,4-Dinitrophenylhydrazine
Explanation
2,4-DNPH reacts with any carbonyl group by addition followed by loss of water, giving a coloured 2,4-dinitrophenylhydrazone precipitate. Its melting point helps identify the original aldehyde or ketone.
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