The reaction used to convert toluene to benzaldehyde is known as :

Q.1 (ix) The reaction used to convert toluene to benzaldehyde is known as :

A. Etard’s reaction

B. Gatterman-Koch formylation reaction

C. Friedel-Crafts reaction

D. Swartz reaction

Doubtly Asked 29 Oct 2026 Board exam · July 2024 hsc 12th Save WhatsApp Report

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Answer: (a) Etard’s reaction

Toluene is oxidised by chromyl chloride (CrO₂Cl₂) in CS₂ to a brown chromium complex, which on hydrolysis (H₃O⁺) gives benzaldehyde:

C₆H₅CH₃ + CrO₂Cl₂ → (CS₂) chromium complex → (H₃O⁺) C₆H₅CHO

Gattermann-Koch formylation starts from benzene (CO + HCl), and the Swartz reaction prepares alkyl fluorides.

Doubtly AI · 29 Oct 2026 AI-verified · Nov 2026 Report

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