The Lewis acid strength of BF_3, BCl_3, and B | vedclass

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Question

(B) The Lewis acid strength depends on the extent of back-bonding between the halogen $p$-orbitals and the empty $p$-orbital of boron. In $BF_3$,the $

Vedclass · Accepted Answer

$BBr_3 > BCl_3 > BF_3$

Vedclass · Answer

(B) The Lewis acid strength depends on the extent of back-bonding between the halogen $p$-orbitals and the empty $p$-orbital of boron. In $BF_3$,the $2p-2p$ overlap between $B$ and $F$ is the most effective due to similar atomic sizes,which significantly reduces the electron deficiency of boron. As the size of the halogen increases $(F Therefore,the electron deficiency on boron increases,making $BBr_3$ the strongest Lewis acid and $BF_3$ the weakest. The correct order of Lewis acid strength is $BBr_3 > BCl_3 > BF_3$.

The Lewis acid strength of $BF_3, BCl_3,$ and $BBr_3$ decreases in the following order:

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