Which following reagent is used in Etard reaction?

Which following reagent is used in Etard reaction?
  1. Chromium chloride
  2. Chromyl chloride
  3. Chromium oxide
  4. Chromic acid

Solution

Methyl group in methyl benzene (or methyl arene) is oxidized by oxidizing agent chromyl chlơride in carbon disulfide as solvent, to form a chromium complex, from which the corresponding benzaldehyde is obtained on acid hydrolysis. This reaction is known as Etard reaction.

Asked in: MHT CET 2023 (13 May Shift 1)

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