Which of the following reagents can form a phenylhydrazone with dimethyl ketone ?

[N H_{3} O H]^{\oplus} C l^{⊖}

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P h N H N H_{2}

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N H_{2} N H C O N H_{2}

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H C N

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Solution

The correct option is C $P h N H N H_{2}$
$C H_{3} C O C H_{3} + H_{2} N - N H - C_{6} H_{5} ⟶ C H_{3} - C H (C H_{3}) = N - N H C_{6} H_{5} P h e n y l h y d r a z o n e + H_{2} O$

So, only $P h N H N H_{2}$ has the necessary phenyl group that is required for the formation of phenylhydrazone.

Hence, option $B$ is correct.

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