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In the following sequence of reactions, ...

In the following sequence of reactions, write the structures of the compounds P,Q and R
`Poverset(Sn//HCl)to Q underset((ii)H_(2)O //H_(3)PO_(2))overset((i)NaNO_(2)//HCl,273-278K)to R overset(KMnO_(4)//OH^(-))to`o-Bromobenzoic acid.

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