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Q.

The tendency of BF3, BCl3 and BBr3 to behave as Lewis acid decreases in the sequence

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a

BCl3 > BF3 > BBr3

b

BBr3 > BCl3 > BF3

c

BBr3 > BF3 > BCl3

d

BF3 > BCl3 > BBr3

answer is B.

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Detailed Solution

Due to back donating bond in BF3, its electron deficiency decrease. Hence Lewis acidic character becomes less 

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The tendency of BF3, BCl3 and BBr3 to behave as Lewis acid decreases in the sequence