The factor responsible for weak acidic nature of B-F bonds in BF3 is

  1. A

    large electronegativity of fluorine

  2. B

    three centred two electron bonds in BF3.

  3. C

     back bonding.

  4. D

     back bonding.

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    Solution:

    BF3 is electron-deficient because B only has six valence electrons. B has one empty 2p orbital, while each F has three lone pairs of electrons. B and F have similar sizes, as a result, B and F orbitals show effective overlapping. Therefore, F can share one of its lone pairs with the unoccupied orbital of B. This results in the formation of  back bonding. This provides additional strength to the B-F bond and makes the B-F bond less acidic.

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