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MHT CET202519 Apr 2025Morning ShiftChemistryHaloalkanes and HaloarenesActual

Identify the compound formed by action of chromyl chloride on toluene in presence of CS ₂ and hydrolysed further?

Options

  1. AChlorobenzene
  2. BBenzal Chloride
  3. CBenzaldehyde
  4. DBenzoic acid

Correct answer

C. Benzaldehyde

Step-by-step solution

Étard Reaction: Toluene undergoes selective oxidation of its methyl group through the Étard reaction. The process involves treatment with chromyl chloride in carbon disulfide to form an intermediate chromium complex. C₆H₅CH₃ + 2CrO₂ Cl₂ [CS₂] C₆H₅CH(OCrOHCl₂)₂ Subsequent acidic hydrolysis of the complex yields benzaldehyde: C₆H₅CH(OCrOHCl₂)₂ [H₃O^+] C₆ H₅ CHO Among the options, only benzaldehyde corresponds to this reaction pathway. Chlorobenzene forms via electrophilic substitution, benzal chloride requires radica

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