What is the molecular formula of the product formed when benzene is reacted with ethyl chloride in presence of anhydrous aluminium chloride?

• Correct answer
  A

  $\mathrm{C}_8 \mathrm{H}_{10}$
• B

  $\mathrm{C}_6 \mathrm{H}_6$
• C

  $\mathrm{C}_8 \mathrm{H}_8$
• D

  $\mathrm{C}_6 \mathrm{H}_5 \mathrm{Cl}$

Solution

In presence of a Lewis acid (like $\mathrm{AlCl}_3$ ), benzene gives electrophilic substitution reaction with alkyl halide. This is called Friedel-Craft alkylation.

Hence, the correct answer is option: 'A'.