1.

Which of the following are Lewis acids ?

Answer»

`PH_(3) and BCl_(3)`
`AlCl_(3) and SiCl_(4)`
`PH_(3) and SiCl_(4)`
`BCl_(3) and AlCl_(3)`

SOLUTION :`BCl_(3)` - electron deficient, incomplete orbit.
`AlCl_(3)` -electron deficient, incomplete octet.
Note. `SiCl_(4)` can accept a lone pair of ELECTRONS in d-orbital of SILICON and HENCE acts as a LEWIS acid.
Hence, option 2 can also be considered as correct


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