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B X 3 + N H 3 → B X 3 . N H 3 + Heat of adduct formation Δ H The numerical value of Δ H is found to be maximum for

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

Lewis acidic strength B F 3 < B C l 3 < B B r 3 < B I 3 As B I 3 is strongest Lewis acid among all boron halides due to back bonding therefore, heat of adduct formation will be maximum numerically, for B I 3 .

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