$3$ -Nitroaniline is subjected to the treatment of various reagents in the following sequences.
(i) $N a N O_{2} / H C l, 280$ K
(ii) KI
(iii) Cu powder
The final product will be:

3, 3^{'} -

diaminobiphenyl

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3, 3^{'}

-dinitrobiphenyl

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3

- nitroiodobenzene

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3

-iodoaniline

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Solution

The correct option is B $3, 3^{'}$ -dinitrobiphenyl
Final step is Ullmann reaction or Ullmann coupling is a coupling reaction between aryl halides and copper.

The final product in the given sequence of reactions is $3, 3^{'} -$ diaminobiphenyl.

Option B is correct.

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