1.

Which of the following are used as catalyst in Friedel-Crafts reactions ?

Answer»

`AlCl_(3)`
`SiCl_(4)`
`BF_(3)` is the strongest Lewisacid among the otherboronhalides
`SnCl_(4)`

Solution :Becauseof big SIZE of Cl atomsand weakinteraction between lone PAIRS OFCL and Si, si cannotexplandits covalencybeyond 4 andhence`SiCl_(4)`cannot have as a catalyst.


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