The Friedel-Crafts reaction involves the substitution of a hydrogen atom on an aromatic compound with an alkyl or acyl group, catalyzed by a Lewis acid like AlCl$_3$. This reaction is typically seen with aromatic compounds.
The other options (aliphatic compounds, alcohols, and aldehydes) do not undergo Friedel-Crafts reactions.
Thus, the correct answer is (a) Aromatic compounds.
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