Question

Under what reaction conditions does the electrophilic chlorination of aromatic compounds usually occur?

• A. \( \text{NaCl, CH}_3\text{OH} \)
• B. \( \text{Cl}_2\text{AlCl}_3 \)
• C. \( \text{Cl}_2\text{CCl}_4 \)
• D. \( \text{NaCl, EtOH} \)

Hint:

Lewis acid catalysts enhance electrophilic aromatic substitution reactions by activating halogens.

Answer 1

The Correct Option is B

Electrophilic chlorination of aromatic compounds is typically carried out using Cl\(_2\) with AlCl\(_3\) as a Lewis acid catalyst. AlCl\(_3\) polarizes Cl\(_2\), making it a stronger electrophile, enabling substitution on the benzene ring. Other options lack sufficient electrophilic activation for effective chlorination.