Question

Why reaction medium not be too badic while preparing 2,4dnp reagent?

Answer 1

Answer :

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).

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Answer 2

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A negative result is the absence of the red precipitate; it is important to note that Fehling's will not work with aromatic aldehydes; in this case Tollens' reagent should be used.

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