Question:

2, 4-DNP test can be used to identify :

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2,4-Dinitrophenylhydrazine (Brady's reagent) condenses with the carbonyl group.
Updated On: Nov 4, 2026
  • ether
  • amine
  • aldehyde
  • halogens
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The Correct Option is C

Solution and Explanation

2,4-DNP (2,4-dinitrophenylhydrazine) reacts with the \(\mathrm{C=O}\) group of aldehydes and ketones to give a yellow/orange/red precipitate of the 2,4-dinitrophenylhydrazone.
It does not react in this way with ethers, amines or halogens.
So the 2,4-DNP test identifies an aldehyde (a carbonyl compound).
Answer: (3) aldehyde
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