Chlorobenzene on reaction with acetyl chloride in presence of anhydrous aluminum chloride forms,

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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, CH₃C⁺=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 (m