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Question

An organic compound gives orange precipitate with 2,4DNPH. What is the functional group in the compound?

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Solution

2,4-Dinitrophenylhydrazine (DNPH, Brady's reagent, Borche's reagent) is a chemical compound. It is substituted hydrazine and is often used to qualitatively test for carbonyl groups associated with aldehydes and ketones.
It is a mixture of sulphuric acid and methanol.

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