Suggest the name of a Lewis acid other than anhydrous aluminium chloride which can be used during ethylation of benzene.

(N/A) The ethylation reaction of benzene involves the addition of an ethyl group to the benzene ring. This reaction is a type of Friedel-Crafts alkylation reaction.
Friedel-Crafts alkylation requires a Lewis acid catalyst to generate the electrophile. Other than anhydrous $AlCl_3$,Lewis acids such as anhydrous $FeCl_3$,$SnCl_4$,or $BF_3$ can also be used for this purpose.