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The Lewis acid character of boron trihal...

The Lewis acid character of boron trihalides decreases as: Explain ?

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According to the `EN` order `(F gt Cl gt B)`, the Lewis acid character should be `BF_(3) gt BCl_(3) gt B Br_(3)` but it observed to be reverse, this can be explained by `(p pi-p pi)` back bonding that occurs in the given halides.
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