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NTA Abhyas NEET2020ChemistryIonic EquilibriumPractice

Among the following, which is the strongest Lewis acid?

Options

  1. AB F 3
  2. BB C l 3
  3. CB B r 3
  4. DB I 3

Correct answer

D. B I 3

Step-by-step solution

The strengths of boron halides as Lewis acids are in the order BI 3 > BBr 3 > BCl 3 > BF 3 . This order is the opposite of what is expected on steric grounds as well as from considerations of electronegatively. It can be explained in terms of boron-halogen-bonding. Here, acidic nature ∝ 1 e x t e n t o f b a c k b o n d i n g

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