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MHT CET202616 April 2026Evening ShiftChemistryHydrocarbonsActual

Identify the catalyst used in the Friedel crafts acylation reaction.

Options

  1. AAnhydrous AlCl ₃
  2. BAnhydrous FeCl ₃
  3. CNaNO ₂
  4. DAlcoholic KOH

Correct answer

A. Anhydrous AlCl ₃

Step-by-step solution

Friedel-Crafts acylation is an electrophilic aromatic substitution reaction in which an acyl group is introduced into an aromatic ring. The reaction requires a strong Lewis acid catalyst to facilitate the generation of the electrophilic acylium ion from an acyl halide or acid anhydride. Anhydrous AlCl ₃ is the standard and most widely used Lewis acid catalyst for this purpose. The general reaction is: ArH + RCOCl Anhydrous AlCl ₃ ArCOR + HCl Answer: Anhydrous AlCl ₃

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