The power of halides of boron to act as Lewis acids decreases in the order
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a
BF3 > BCl3 > BBr3
b
BBr3 > BCl3 > BF3
c
BCl3 > BF3 > BBr3
d
BCl3 > BBr3 > BF3
answer is B.
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Detailed Solution
Order of Lewis acid strength of boron halides isBI3 > BBr3 > BCl3 > BF3 This order is explained on the basis of pπ-pπ back bonding opposite to expected order due to electronegativity