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Suggest reasons why the B–F bond lengths...

Suggest reasons why the B–F bond lengths in `BF_(3)` (130 pm) and `BF_(4 )^(– )`(143 pm) differ.

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Due to `P pi-P pi` back bonding in `BF_3` molecule (for details, (3), Figs. B-F bond acquires some double bond character. This shortens the B-F bond length. In `BF_4^-`, the B-F bond is a pure single bond and has a larger bond length. This is why B-F bond length in `BF_3` is shorter as compared to that in `BF_4^-` .
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ICSE-SOME P-BLOCK ELEMENTS -NCERT TEXTBOOK EXERCISES (With Hints and Solutions)
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  3. Suggest reasons why the B–F bond lengths in BF(3) (130 pm) and BF(4 )^...

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