Question

Identify the product obtained when chlorobenzene is treated with acetyl chloride in presence of anhy. \(\text{AlCl}_{3}\).

• A. Mixture of 2-Chloroacetophenone and 4-chloroacetophenone.
• B. Mixture of 2-Chlorotoluene and 4-Chlorotoluene
• C. Mixture of 1, 2-Dichlorobenzene and 1, 4-Dichlorobenzene
• D. Acetophenon and \(\text{Cl}_{2}\)

Hint:

Chlorine is ortho and para directing, so the acetyl group enters at those positions.

Answer 1

The Correct Option is A

Step 1: Understanding the Concept
Chlorobenzene with acetyl chloride and anhydrous \(\text{AlCl}_{3}\) undergoes Friedel-Crafts acylation, introducing the \(\text{-COCH}_{3}\) group.

Step 2: Directing effect
The chlorine atom is deactivating but ortho and para directing through its lone pairs.

Step 3: Product
The acetyl group enters at the ortho and para positions.
The products are 2-chloroacetophenone (minor) and 4-chloroacetophenone (major).

Final Answer:
A mixture of 2-chloroacetophenone and 4-chloroacetophenone is formed. \[ \boxed{\text{(A) }\text{Mixture of 2-Chloroacetophenone and 4-chloroacetophenone.}} \]