The Lewis acid character of boron trihalides | vedclass

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Question

(D) The Lewis acidity of boron trihalides is determined by the extent of $p\pi-p\pi$ back bonding between the halogen atom and the boron atom.In $BF_3

Vedclass · Accepted Answer

$BI_3 > BBr_3 > BCl_3 > BF_3$

Vedclass · Answer

(D) The Lewis acidity of boron trihalides is determined by the extent of $p\pi-p\pi$ back bonding between the halogen atom and the boron atom.In $BF_3$,the $2p-2p$ overlap is most effective,resulting in the strongest back bonding,which reduces the electron deficiency of the boron atom.As we move from $BF_3$ to $BI_3$,the size of the halogen atom increases,making the $p\pi-p\pi$ overlap less effective $(2p-2p > 2p-3p > 2p-4p > 2p-5p)$.Consequently,the extent of back bonding decreases,and the Lewis acidity increases in the order: $BF_3 < BCl_3 < BBr_3 < BI_3$.

The Lewis acid character of boron trihalides follows the order:

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