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

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BCI3 < BF3 < BBr3

BBr3 > BCI3 > BF3

BBr3 < BF3 < BCI3

BF3 > BCI3 >BBr3

answer is B.

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Detailed Solution

The effect of increase of pπ‐pπ back bonding from BBr3 to BF3, hence decreases the Lewis acidic character from BBr3 to BCl3 to BF3.

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