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NTA Abhyas JEE Main2020ChemistryIonic EquilibriumPractice

Which one shows the best formation of adduct?

Options

  1. AO C H 3 2 + B F 3
  2. BO S i H 3 2 + B F 3
  3. CO S i H 3 2 + B B r 3
  4. DO C H 3 2 + B B r 3

Correct answer

D. O C H 3 2 + B B r 3

Step-by-step solution

In B F 3 , there is 2p π -2p π back bonding so its Lewis acidic character is less, similarly in O . . S i H 3 2 there is 2p π -3d π back bonding, so it is a weak Lewis base O ( C H 3 ) 2 is strong Lewis base and B B r 3 is strong Lewis acid so there show the best formation of adduct. BBr 3 LA + O CH 3 2 LB → (CH 3 ) 2 O → BBr 3 Adduct

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