The correct order of Lewis acidic character o | vedclass

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(C) The Lewis acidity of boron trihalides depends on the extent of $p\pi-p\pi$ back-bonding between the halogen atom and the boron atom.In $BF_3$,the

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$BI_3 > BBr_3 > BCl_3 > BF_3$

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(C) The Lewis acidity of boron trihalides depends on the extent of $p\pi-p\pi$ back-bonding between the halogen atom and the boron atom.In $BF_3$,the small size of the $F$ atom allows for effective $2p-2p$ back-bonding,which reduces the electron deficiency of the boron atom.As we move from $F$ to $I$,the size of the halogen atom increases,making the $p\pi-p\pi$ back-bonding less effective.Therefore,the electron deficiency of the boron atom increases,leading to an increase in Lewis acidic character.The correct order is $BI_3 > BBr_3 > BCl_3 > BF_3$.

The correct order of Lewis acidic character of boron trihalides is

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