1.

In the reaction

Answer»

`H_(3)PO_(2)` and `H_(2)O`
`H^(+)//H_(2)O`
`HgSO_(4)//H_(2)SO_(4)`
`Cu_(2)Cl_(2)`.

Solution :`H_(3)PO_(2)` and `H_(2)O` brings about replacement of DIAZONIUM chloride GROUP by H.


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