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Q.

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

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a

PhNHNH2

b

HCN

c

NH2OH

d

NH2NHCONH2

answer is B.

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Detailed Solution

  • CH3​COCH3​ + H2​N−NH−C6​H5​⟶PhenylhydrazoneCH3​−CH(CH3​)=N−NHC6​H5​​+H2​O.
  • 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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