Boron forms BX_3 type of halides. The correct | vedclass

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(B) The Lewis acidity of boron halides depends on the extent of $p\pi-p\pi$ back-bonding between the halogen atom and the boron atom.The tendency for

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$BI_3 > BBr_3 > BCl_3 > BF_3$

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(B) The Lewis acidity of boron halides depends on the extent of $p\pi-p\pi$ back-bonding between the halogen atom and the boron atom.The tendency for back-donation from the halogen to the vacant $p$-orbital of boron is highest in $BF_3$ due to the small size of the fluorine atom,which allows for effective overlap.As the size of the halogen increases from $F$ to $I$,the effectiveness of back-bonding decreases,making the boron atom more electron-deficient.Therefore,the decreasing order of Lewis acidity is $BI_3 > BBr_3 > BCl_3 > BF_3$.

Boron forms $BX_3$ type of halides. The correct increasing order of Lewis-acid strength of these halides is

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