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

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Q. The tendency of $BF_3, BCl_3$ and $BBr_3$ to behave as Lewis acid decreases in the sequence

The p-Block Elements

Solution:

As the extent of $p\pi - p\pi$ back bonding decreases, electron-deficiency increases and hence the Lewis acid strength increases, i.e., option (c) is correct.