bond length of bf3 and bf4- which is greater?
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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.
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Answer:B-F bond length in BF3 is 130 pm as boron in BF3 is sp2 hybridised and has a planar triangular structure. As a result of deficiency of electrons on the boron atom, the excessive electron density on the fluorine atoms (due to its small size and strong interelectronic repulsions) is pushed on to the boron atom that is back donation or back bonding occurs. This introduces a partially double bond character shortening the B-F bond.
In BF4-, the boron atom is sp3 hybridised with B-F bond length of 143 pm.
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