Question

why is B-F bond length smaller in BF3 than BF4 - ..?

Answer 1

 The B-F bond length in BF4 - is greater than that in BF3, because the the bond angle in the former is less than the bond angle in the latter and this leads to increased inter-electronic repulsions between the fluorine atoms which leads to increase in the bond length.

Answer 2

Heya!

Thanks for a creative question!

Explanation:

The BF3 molecule is sp2 hybridized and therefore has a bond angle(angle between the two bonds in a molecule) of 120°

whereas

The BF4^- molecule is sp3 hybridized and therefore has a bond ane of 109°28'

Also, greater the bond angle smaller is the bond length..and vice versa.

therefore..bond length in BF3 is smaller than that in BF4^-

hope it helps!

cheers.

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thanks!