Which of the following does NOT give an orange-yellow precipitate with 2,4-dinitrophenylhydrazine?

Apropanone
Bbenzaldehyde
Cethyl ethanoate
Dcyclopentanone

Answer: C

2,4-DNP condenses only with aldehydes and ketones to give 2,4-dinitrophenylhydrazones. An ester has no free aldehyde or ketone carbonyl, so it gives no precipitate.

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