Question

What is the main reactant in the prepartion of benzaldehyde by Etard's reaction?

• A. Toluene
• B. Ethyl benzene
• C. Benzoyl chloride
• D. Sodium benzoate

Answer 1

Answer: (A)

Toluene can be oxidized to benzaldehyde with a solution of chromyl chloride $\left(Cr{O}_{2}C{l}_2\right)inC{S}_{2}orCC{l}_4.$ This is known as Etard's reaction.

Further oxidation of benzaldehyde to benzoic acid is avoided by protection of carbonyl group.