1.

Benzene diazonium chloride can be converted into benzene on treatment with

Answer»

`H_(3)PO_(3)`
`H_(3)PO_(4)`
`H_(3)PO_(2)`
`HPO_(3)`

Solution :BENZENE diazonium salts on reduction with `H_(3)PO_(2)` in presence of `Cu^(+)` ions GIVES benzene.
`C_(6)H_(5)N_(2)Cl+H_(3)PO_(2)+H_(2)O overset(Cu^(+))rarr C_(6)H_(6)+N_(2)+HCl+H_(3)PO_(3)`


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