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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

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a
Significant pπpπ interaction between B and F in BF3 whereas there is no possibility of such interaction between C and F in CF4 .
b
Lower degree of pπpπ interaction between B and F in BF3 than that between C and F in CF4 .
c
Smaller size of B atom as compared to that of C atom.
d
Stronger o bond between Band F in BF3 as compared to that between C and F in CF4 .

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detailed solution

Correct option is A

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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