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overset(Br(2)//FeBr(3))rarr P overset("S...

`overset(Br_(2)//FeBr_(3))rarr P overset("Sn/con.HCl")rarrQ `
(i) `NaNO_(2), 273K underset("(ii) water, warm")overset(overset(+)("dil. Hcl"))rarr R`
The final product R is

A

B

C

D

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