Question

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Question in attachment

Answer 1

Answer: [A] is Nitro benzene ( which is NO2 group connected to Benzene)

[B] is Aniline ( Benzene with NH2 group)

Explanation: When you add HNO2 (nitric acid) or NaNO2 in the presence of copper, to Benzene diazonium salt, you get HCl as a by-product in case of HNO2 and NaCl as a by-product in case of NaNO2, and the remaining NO2 group is attached to the benzene ring (forms nitro benzene) , which substitutes N2+ group which eventually leaves, for it is a better leaving group!

And when you add Sn/HCl to nitro benzene, you get aniline, which is an aromatic amine! So that's the final product obtained here!