MHTCET 13 Apr 2026 Shift 1 Paper

Concept:The Etard reaction is a controlled oxidation that converts an aromatic methyl group into an aldehyde using chromyl chloride.Explanation:The reagent used in the Etard reaction is chromyl chloride, $\mathrm{CrO}_{2}\mathrm{Cl}_{2}$.In this reaction, the methyl group attached to a benzene ring is oxidised selectively to an aldehyde group.For example, toluene is converted to benzaldehyde:$$\mathrm{C}_{6}\mathrm{H}_{5}\mathrm{CH}_{3} \xrightarrow{\mathrm{CrO}_{2}\mathrm{Cl}_{2}} \mathrm{C}_{6}\mathrm{H}_{5}\mathrm{CHO}$$Therefore, the correct option is the one that lists chromyl chloride.Answer:Option D: Chromyl chloride