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Question

Which of the following is the correct prediction about observed BF bond length, in BF3 molecule?

A
The bond length is more than actual because of the large difference in electronegativity value.
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B
The small bond length is due to pπpπ back bonding.
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C
Both (a) and (b)
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D
None of these
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Solution

The correct option is B The small bond length is due to pπpπ back bonding.
In boron trifluoride, BF3, backbonding is possible as a lone pair of electrons from F atom flow into the vacant p orbital of the electron-deficient B atom.

As a back bond is a partial double bond so bond length decreases due to back bonding.

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