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Explain why the B - X bond distance in B...

Explain why the B - X bond distance in `BX_3` is shorter than the theoretically expected value.

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This is due to `p pi-p pi` backhanding of the fully filled p - orbital of halogen (X) in to the empty p -orbital of boron. As a result, the B -X bond possesses some double bond character and hence B -X bond is shorter than expected.
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CHHAYA PUBLICATION-SOME p-BLOCK ELEMENTS-QUESTION-ANSWER ZONE FOR BOARD EXAMINATION ( SHORT ANSWER TYPE)
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