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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

Vedclass · Accepted Answer

$BI_3 > BBr_3 > BCl_3 > BF_3$

Vedclass · Answer

(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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