Which among the following is used as reagent in laboratory for the detection of a carbonyl group...

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Which among the following is used as reagent in laboratory for the detection of a carbonyl group?
(a) \( \mathrm{C}_{6} \mathrm{H}_{5} \mathrm{NH}_{2} \)
(b)
(c) \( \mathrm{NH}_{2} \mathrm{OH} \)
(d) 2, 4-dinitrophenylhydrazine
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