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MHT CET202520 Apr 2025Morning ShiftChemistryAldehydes and KetonesActual

Which from following reagents is used in Gatterman-Koch formylation of arene?

Options

  1. AAlH ( i - Bu )₂
  2. BCO , HCl (anhyd. AlCl ₃ )
  3. CCrO ₂ Cl ₂ ( CS ₂ )
  4. DDIBAI - H

Correct answer

B. CO , HCl (anhyd. AlCl ₃ )

Step-by-step solution

The Gatterman-Koch reaction is a Friedel-Crafts acylation that formylates aromatic rings using carbon monoxide and hydrogen chloride with anhydrous aluminum chloride catalysis. Carbon monoxide and hydrogen chloride combine with AlCl ₃ to generate the formyl cation electrophile: CO + HCl + AlCl ₃ [ HCO ^+] AlCl ₄^- . This species undergoes electrophilic aromatic substitution, attacking the ring and forming an arenium ion intermediate that deprotonates to yield the aldehyde product. Option A ( AlH (i- Bu )₂ ) and D (

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