What is 2,4 DNP Test?
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- 2,4-DNP derivatives offer a convenient way of separating the components of a mixture of aldehydes and ketones.
- Rather than attempting to do this directly by fractional distillation, a chemist might take advantage first of the easy separation of 2,4-DNP derivatives by column chromatography.
- Since their formation from aldehydes and ketones is reversible, hydrolysis of the separated derivatives will then regenerate the original carbonyl compounds.
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2,4-Dinitrophenylhydrazine can be used to qualitatively detect the carbonyl functionality of a ketone or aldehyde functional group. A positive test is signalled by the formation of a yellow, orange or red precipitate (known as a dinitrophenylhydrazone).
Chemical formula: C6H6N4O4
Appearance: Red or orange powder
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