Question

Identify the catalyst used in the Friedel crafts acylation reaction.

• A. Anhydrous \(\text{AlCl}_3\)
• B. Anhydrous \(\text{FeCl}_3\)
• C. \(\text{NaNO}_2\)
• D. Alcoholic KOH

Hint:

A strong Lewis acid forms the acylium ion.

Answer 1

The Correct Option is A

Step 1: Mechanism
$RCOCl + AlCl_3 \rightarrow RCO^+ + AlCl_4^-$. The acylium ion substitutes a ring hydrogen.

Step 2: Result
Anhydrous AlCl3, option (A).

Final Answer:
AlCl3. \[ \boxed{\text{(A)}\ \text{Anhydrous }AlCl_3} \]