The number of $\pi$-bonds and lone pair(s) present in the major benzenoid product, which formed when benzene is reacted with acetyl chloride in the presence of anhydrous aluminium chloride, respectively are

• A

  5 : 2
• Correct answer
  B

  4 : 2
• C

  5 : 4
• D

  6 : 4

Solution

The product formed is acetophenone. Benzene reacts with acetyl chloride in presence of $\mathrm{AlCl}_3$ to give acetophenone.
The number of $\pi$ bonds and lone pairs are 4 and 2 respectively.

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