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  4. The power of halides of boron to act as Lewis acids decreases in the order

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Q. The power of halides of boron to act as Lewis acids decreases in the order

The p-Block Elements

Solution:

Order of Lewis acid strength of boron halides is
$BI_{3} > BBr_{3} > BCl_{3} > BF_{3}$
This order is explained on the basic of $p \pi - p \pi$ back bonding opposite to expected order due to electronegativity