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Suggest reason why the B-F bond lengths in BF3 (130 pm) and BF (143 pm) differ.

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In BF3, B atom is sp2 hybridised and it has One unhybridised empty 2p atomic orbital. This empty 2p orbital overlaps sideways from both the sides with fully filled 2p atomic orbital of F atom to form dative pΠ-pΠ bond that reduces the bond length.
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Related Questions

How would you explain the lower atomic radius of Ga as compared to Al?
Ga is present in 3rd period after the d-block in the periodic table, In this due to poor shielding effect of d electron effective nuclear charge increases that pull outershell electron more strongly hence has smaller size.
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