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Which of the following is not Lewis acid...

Which of the following is not Lewis acid?

A

`AlCl_(3).6H_(2)O`

B

`AlCl_(3)`

C

`SnCl_(4)`

D

`FeCl_(3)`

Text Solution

Verified by Experts

The correct Answer is:
A
`AlCl_(3)` acts as a lewis acid as central atom Al has incomplete octet . `SnCl_(4) and FeCl_(3)` act as lewis acid because Sn and Fe both have empty d- orbitals. `AlCl_(3) " I "sp^(2)` hybridised, i.e. it has vacant one 3p orbital and five 3d orbitals. But in`AlCl_(3).6H_(2)O` one vacant 3p orbital and five vacant 3d orbitals are filled by the electron pair of oxygen. So `AlCl_(3).6H_(2)O` cannot act as a lewis acid .
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