Answer:
The Al atom in \[AlC{{l}_{3}},\] has
only 6 electrons in its valence shell. It needs two more electrons to complete
its octet. It, therefore, acts as a Lewis acid catalyst in Friedel-Crafts
alkylation and acylation reactions of benzene and other aromatic compounds. In
these reactions, it helps to generate the electrophile (\[{{R}^{+}}\] or\[RC{{O}^{+}}\])
which attacks the benzene/aromatic ring.
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