Correct option is A
The Étard reaction is a chemical reaction that involves the direct oxidation of an aromatic or heterocyclic bond methyl group to an aldehyde using chromyl chloride. For example, toluene can be oxidized to benzaldehyde.
The Étard reaction is a chemical reaction that involves the direct oxidation of an aromatic or heterocyclic bond methyl group to an aldehyde using chromyl chloride. For example, toluene can be oxidized to benzaldehyde.