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Which of the following reagents can form a hydrazone with alkanone ?

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NH₂OH

PhNHNH₂

NH₂NHCONH₂

HCN

answer is B.

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Detailed Solution

CH₃COCH₃ + H₂N−NH−C₆H₅⟶PhenylhydrazoneCH₃−CH(CH₃)=N−NHC₆H₅+H₂O.
acetone is the example of Alkanone
So, only PhNHNH₂ has the necessary phenyl group that is required for the formation of phenylhydrazone.

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