Compounds of which of the following elements can act as the catalyst in aromatic substitution reaction ?

Compounds of which of the following elements can act as the catalyst i

1.	Compounds of which of the following elements can act as the catalyst in aromatic substitution reaction ?
Answer» GA,Tl In,Tl B,Al Ga,In Solution :`BF_3` and `AlCl_3` are strong Lewis acids and THEREFORE used as a catalyst in Friedal and CRAFT alkylation reaction and electrophillic aromatic SUBSTITUTION reaction.