Q. Consider the following reaction, and choose the correct option. Toluene (C₆H₅–CH₃) —(i) CrO₂Cl₂, CS₂; (ii) H₃O⁺→ P
A) Compound P is obtained by the hydrogenation of benzoyl chloride with Pd on BaSO₄
B) On treating compound P with saturated NaHCO₃ solution, brisk effervescence is observed
C) Compound P can be prepared by treating benzene with anhydrous AlCl₃ and CH₃COCl
D) On treating with bromine water, compound P gives a white precipitate
Explanation
[Solution from source] The Etard reaction stops oxidation of toluene at benzaldehyde, so P is benzaldehyde, which is also made by Rosenmund reduction of benzoyl chloride (H₂, Pd/BaSO₄). Benzaldehyde does not release CO₂ from NaHCO₃, Friedel–Crafts acylation with CH₃COCl gives acetophenone, and a white precipitate with bromine water is a test for phenol. Answer (1).
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.