$2, 4$ -DNP test can be used to identity:

Halogens

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Aldehyde

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Ether

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Amine

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Solution

The correct option is B Aldehyde
$2, 4$ -DNP test is used to identify $> C = O$ group. It gives addition reaction with carbonyl compounds. So, it can be used to identify aldehyde in the given option. It gives yellow/orange ppt. with carbonyl containing compounds.

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A compound does not give a positive test with 2,4-DNP. The compound is:

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X

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