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The tendency of BF_{3} , BCl_{3} and BBr_{3}  to behave as Lewis acid decrease in the sequence:

  • Option 1)

    BCl_{3}> BF_{3}> BBr_{3}

  • Option 2)

    BBr_{3}> BCl_{3}> BF_{3}

  • Option 3)

    BBr_{3}> BF_{3}> BCl_{3}

  • Option 4)

    BF_{3}> BCl_{3}> BBr_{3}

 

Answers (1)

best_answer

 

@11865

- wherein

 

Due to small size and high electronegativity

 

  Lewis acid character of Boron trihalides obey the order : BBr_{3}> BCl_{3> }BF_{3}

BF_{3}  is a weak lewis acid because of p\pi -p\pi lock bonding between the 2p ortibals of F and vacant 2p ortibals of B. This result in fall of the electron dificient nature of BF_{3} and lewis it a number lewis acid. Such back bonding is not possible in BCl_{3}  and BBr_{3} due to huge difference in orbital energies.


Option 1)

BCl_{3}> BF_{3}> BBr_{3}

Incorrect Option

Option 2)

BBr_{3}> BCl_{3}> BF_{3}

Correct Option

Option 3)

BBr_{3}> BF_{3}> BCl_{3}

Incorrect Option

Option 4)

BF_{3}> BCl_{3}> BBr_{3}

Incorrect Option

Posted by

divya.saini

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