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(D) $2,4$-$DNP$ ($2$,$4$-dinitrophenylhydrazine) is a reagent used to identify the presence of a carbonyl group (aldehydes and ketones).All the given

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(D) $2,4$-$DNP$ ($2$,$4$-dinitrophenylhydrazine) is a reagent used to identify the presence of a carbonyl group (aldehydes and ketones).All the given compounds contain a carbonyl group:$(a)$ Acetone $(CH_3COCH_3)$ is a ketone.$(b)$ Butan-$2$-one $(CH_3COCH_2CH_3)$ is a ketone.$(c)$ Acetaldehyde $(CH_3CHO)$ is an aldehyde.$(d)$ Formaldehyde $(HCHO)$ is an aldehyde.Since all these compounds possess a carbonyl group,they all react with $2,4$-$DNP$ to form a yellow,orange,or red precipitate.Therefore,the correct option is $D$.

Which of the following compounds gives a positive test with $2,4$-$DNP$ ($2$,$4$-dinitrophenylhydrazine)?
$(a)$ Acetone
$(b)$ Butan-$2$-one
$(c)$ Acetaldehyde
$(d)$ Formaldehyde

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Which of the following compounds gives a positive test with $2,4$-$DNP$ ($2$,$4$-dinitrophenylhydrazine)?$(a)$ Acetone$(b)$ Butan-$2$-one$(c)$ Acetaldehyde$(d)$ Formaldehyde