Benzene is acylated with $CH X_{3} COCl$ and anhydrous $AlCl X_{3}$ to give A. A is reduced with Zn-Hg/conc. HCl to give B. B is heated with alkaline $KMnO X_{4}$ and then acidified to give C. C is treated with $Br X_{2} / FeBr X_{3}$ to give D. D is

A4-bromobenzoic acid
B3-bromobenzoic acid
C2-bromobenzoic acid
Dbenzoyl bromide

Answer: B

A is acetophenone, B is ethylbenzene (Clemmensen), C is benzoic acid (any alkyl side chain with a benzylic H is oxidised to COOH). The carboxyl group is a meta director, so bromination gives 3-bromobenzoic acid.

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Answer: B

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Benzene is acylated with $CH X_{3} COCl$ and anhydrous $AlCl X_{3}$ to give A. A is reduced with Zn-Hg/conc. HCl to give B. B is heated with alkaline $KMnO X_{4}$ and then acidified to give C. C is treated with $Br X_{2} / FeBr X_{3}$ to give D. D is