Q. Etard’s reaction involves the preparation of benzaldehyde from
A) Toluene
B) Ethyl benzene
C) Benzoyl chloride
D) Sodium benzoate
Explanation
(a)
Toluene can be oxidized to benzaldehyde with a solution of chromyl chloride $\left( CrO_{2}Cl_{2} \right)\ in\ CS_{2}\ or\ CCl_{4}.$ This is known as Etard reaction
[image:12_image653.emf]
Further oxidation of benzaldehyde to benzoic acid is avoided by protection of carbonyl group
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.