Question

The final product R is

• A.
• B.
• C.
• D.

Answer 1

The Correct Option is C

In the first step, bromine reacts with nitrobenzene in the presence of FeBr₃, forming a bromonitrobenzene derivative (product $P$).
In the second step, sodium nitrite ($\text{NaNO}_2$) at 273 K reacts with the product to form a diazonium salt ($Q$).
In the third step, the diazonium salt reacts with dilute HCl to produce a phenol derivative.
Finally, when the reaction mixture is warmed with water, the diazonium group is replaced by a hydroxyl group, forming $\text{OH} \, \text{Br}$ as the final product, which corresponds to option (C).

Thus, the final product $R$ is $\text{OH} \, \text{Br}$.