The bond dissociation energy of B-F in BF3 is 646 kJ mol whereas that of C-F in CF4 is 515 kJ mol “. The correct reason for higher B-F bond dissociation energy as compared to that of C-F is

The bond dissociation energy of B-F in BF3 is 646 kJ mol whereas that of C-F in CF4 is 515 kJ mol ". The correct reason for higher B-F bond dissociation energy as compared to that of C-F is

  1. A

    Significant pπpπ interaction between B and F in BF3 whereas there is no possibility of such interaction between C and F in CF4 .

  2. B

    Lower degree of pπpπ interaction between B and F in BF3 than that between C and F in CF4 .

  3. C

    Smaller size of B atom as compared to that of C atom.

  4. D

    Stronger o bond between Band F in BF3 as compared to that between C and F in CF4 .

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    Solution:

    There exists significant pπpπ  interaction between B and F due to back bonding of lone pair of electrons on F to an empty p orbital on B. There is no such interaction in CF4.

     

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