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Mechanism of Acylation
Aluminium chloride is a Lewis acid able to take chlorine along with its electron pair from an acyl chloride:

The resulting carbocation attacks the benzene ring to give

The aromatic ring is restored, to give the product


But unfortunately the ketone forms a complex with the AlCl3

3 moles of water are needed to liberate the ketone from the complex, incidentally destroying the AlCl3.

This means that the Lewis acid has to be present in stoichiometric quantities.
Question

Classify this type of organic reaction

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Question

Write an equation for this final step.

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