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Why does boron triflouride behave as a L...

Why does boron triflouride behave as a Lewis acid ?

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Boron atom in `BF_(3)` in `sp^(2)` hybridised.
In `BF_(3),B` atom has only six electrons in the valance shell and has an empty `2p` orbital in which it can easily accept a pair of electron from some other molecule/ion. Hence, `BF_(3)` behaves as a Lewis acid.
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