Q.

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
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