Answer the following questions: Which catalyst is used in the Friedel-Crafts alkylation reaction? And what is its function?

(N/A) Anhydrous $AlCl_{3}$ is used as a catalyst in the Friedel-Crafts alkylation reaction.
This catalyst acts as a Lewis acid. Its function is to accept a chloride ion $(Cl^{-})$ from the alkyl halide $(R-Cl)$ to form an $AlCl_{4}^{-}$ complex,thereby generating a carbocation $(R^{+})$,which acts as a strong electrophile.
The reactions are as follows:
$CH_{3}Cl + AlCl_{3} \longrightarrow AlCl_{4}^{-} + CH_{3}^{+}$
$CH_{3}CH_{2}Cl + AlCl_{3} \longrightarrow AlCl_{4}^{-} + CH_{3}CH_{2}^{+}$