Q36 / 150 · MHT CET 2026 (16 April Shift 2) · Chemistry
Identify the catalyst used in the Friedel crafts acylation reaction.
- Correct answerAAnhydrous $\text{AlCl}_3$
- BAnhydrous $\text{FeCl}_3$
- C$\text{NaNO}_2$
- DAlcoholic KOH
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 $\text{AlCl}_3$ is the standard and most widely used Lewis acid catalyst for this purpose.
The general reaction is:
$\text{ArH} + \text{RCOCl} \xrightarrow{\text{Anhydrous AlCl}_3} \text{ArCOR} + \text{HCl}$
Answer: Anhydrous $\text{AlCl}_3$
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 $\text{AlCl}_3$ is the standard and most widely used Lewis acid catalyst for this purpose.
The general reaction is:
$\text{ArH} + \text{RCOCl} \xrightarrow{\text{Anhydrous AlCl}_3} \text{ArCOR} + \text{HCl}$
Answer: Anhydrous $\text{AlCl}_3$
Hence, the correct answer is option: 'A'.