1.

The reduction of benzenediazonium chloride to phenyl hydrazine can be accomplished by

Answer»

`SnCl_(2), HCl`
`Na_(2)SO_(3)`
`CH_(3)CH_(2)OH`
`H_(3)PO_(2)`

Solution :
Benzenediazonium chloride FORMS phenylhydrazine with `Na_(2)SO_(3)` and mild REDUCING agents such as `SnCl_(2)//HCl` while benzenediazonium chloride upon reduction with hypophosphorous acid `(H_(3)PO_(2))` or ETHANOL at room temperature gives benzene.


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