Chlorobenzene on reaction with acetyl chloride in presence of...

The reaction of chlorobenzene with acetyl chloride in the presence of anhydrous aluminum chloride is a Friedel-Crafts acylation reaction.

The electrophile generated is the acylium ion, $CH_3C^{+}=O$.

In chlorobenzene, the chlorine atom is an ortho, para-directing group due to the $+R$ resonance effect of its lone pair of electrons, which increases electron density at the ortho and para positions.

Therefore, the electrophilic substitution occurs at the ortho and para positions, yielding a mixture of 2-chloroacetophenone (minor product) and 4-chloroacetophenone (major product).

Answer: 2-Chloroacetophenone and 4-Chloroacetophenone