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Which of the following reactions does not give benzaldehyde?(a) Rosenmund reaction(b) Etard reaction(c) Gatterman-Koch reaction(d) Friedel-Craft acylation reactionThe question was posed to me by my college professor while I was bunking the class.The query is from Preparation of Aldehydes and Ketones topic in section Aldehydes, Ketones and Carboxylic Acids of Chemistry – Class 12

Answer»

Right option is (d) Friedel-Craft acylation reaction

To explain I would say: Friedel-Crafts acylation of BENZENE produces an aromatic KETONE and not BENZALDEHYDE. Benzene on Gatterman-Koch reaction GIVES benzaldehyde, so does toluene on Etard reaction. Rosenmund reaction also gives benzaldehyde but from benzoyl CHLORIDE.



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