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Identify ‘X’ in the reaction given below.(a) CrO3(b) CrO2Cl2(c) Alkaline KMnO4(d) Anhydrous AlCl3The question was posed to me in an online interview.My question is based upon Preparation of Aldehydes and Ketones in portion Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12

Answer»

The correct answer is (b) CrO2Cl2

Explanation: This is known as Etard reaction. The CHROMYL chloride oxidises the METHYL group to a CHROMIUM complex in CS2. This complex on HYDROLYSIS gives benzaldehyde.



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