Question

What are the reactants involved in Friedal Crafts alkylation?

• A. \(\text{C}_6\text{H}_6+\text{NH}_3\)
• B. \(\text{C}_6\text{H}_6+\text{CH}_3\text{Cl}\)
• C. \(\text{C}_6\text{H}_6+\text{CH}_3\text{COCl}\)
• D. \(\text{C}_6\text{H}_6+\text{CH}_4\)

Hint:

Alkylation needs an alkyl halide with anhydrous AlCl3; acylation needs an acyl chloride.

Answer 1

The Correct Option is B

Step 1: Idea
The electrophile is a carbocation (or polarised complex) generated from an alkyl halide with $\text{AlCl}_3$.

Step 2: Check options
CH3Cl is an alkyl halide, so benzene plus CH3Cl alkylates. CH3COCl is an acyl chloride and gives acylation instead.

Step 3: Answer
Option (B).

Final Answer:
Option (B). \[ \boxed{\text{C}_6\text{H}_6 + \text{CH}_3\text{Cl}} \]