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Manipal MET2015Chemistryp Block Elements (Group 13 & 14)

The relative Lewis acid character of boron trihalides is the order

Options

  1. ABI ₃ BBr ₃ BF ₃ BCl ₃
  2. BBI ₃ BBr ₃ BCl ₃ BF ₃
  3. CBF ₃ BCl ₃ BBr ₃ Bl ₃
  4. DBCl ₃ BF ₃ BI ₃ BBr ₃

Correct answer

B. BI ₃ BBr ₃ BCl ₃ BF ₃

Step-by-step solution

BI ₃ BBr ₃ BCl ₃ BF ₃ This order can be easily explained on the basis of the tendaney of the halogen atom to back donate its lone pair of electrones to empty p-orbital of the boron atom through p -p bonding.

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