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All Lewis acids are not Bronsted acids. ...

All Lewis acids are not Bronsted acids. Why?

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A Lewis acid is that which accept a lone pair of electrons.
Eg: `BF_(3)` can accept a lone pair.
A Bronsted acid is that which donate a proton. Eg. : HCl. So Lewis acids may not contain proton but can accept lone pair. Hence all Lewis acids are not Bronsted acids.
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