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Question

XZn/HCl−−−−PhNO2Zn+KOH/C2H5OH−−−−−−−−−−−Y


Identify X and Y in the given reactions:

A
PhNO,PhNHNHPh
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B
PhNH2,PhNHNHPh
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C
PhNHOH,PhNHNHPh
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D
PhNHNHPh,PhNHOH
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Solution

The correct option is B PhNHOH,PhNHNHPh
When nitrobenzene is reduced with a neutral reducing agent (Zn / NH4Cl), phenylhydroxyl amine is formed.
PhNO2+2HZn+NH4Cl−−−−−−H2OPhNHOHphenylhydroxylamine
Hence, compound X is PhNHOH.
When nitrobenzene is reduced with alkaline reducing agent such as Zn + KOH/ethanol, hydrazobenzene is obtained.
PhNO2Zn+KOH/C2H5OH−−−−−−−−−−−PhNHNHPh.

Hence, compund Y is PhNHNHPh.


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