Which of the following reagent is used to identify carbonyl group from other functional groups?

L i A l H_{4}

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N a B H_{4}

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2,4-dinitrophenylhydrazine

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None of the above

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Solution

The correct option is C 2,4-dinitrophenylhydrazine

2,4-dinitrophenylhydrazine (2,4-DNP) gives orange colour precipitate with aldehydes and ketones. This is used for identification of aldehydes and ketones. Hence, the correct answer is option (c).

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Name of the functional homologous group is derived from two specific words, carbonyl and hydroxyl. Identify it.

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