In which of the following compounds B-F bond | vedclass

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(C) In $BF_3$,the boron atom has an empty $2p$ orbital,which allows for $p\pi - p\pi$ back-bonding from the fluorine lone pairs to the boron atom. Thi

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$BF_3$

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(C) In $BF_3$,the boron atom has an empty $2p$ orbital,which allows for $p\pi - p\pi$ back-bonding from the fluorine lone pairs to the boron atom. This back-bonding imparts partial double bond character to the $B-F$ bond,thereby shortening its length. In the other compounds ($BF_4^-$,$BF_3 \leftarrow NH_3$,and $BF_3 \leftarrow N(CH_3)_3$),the boron atom is $sp^3$ hybridized and does not have a vacant $p$-orbital,so no back-bonding occurs. Therefore,the $B-F$ bond length is shortest in $BF_3$.

In which of the following compounds $B-F$ bond length is shortest?

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