The bond dissociation energy of B—F bond in BF3 is 646 kJ mol–1 whereas that of C—F in CF4 is 315 kJ mol–1. The correct reason for higher B-F bond dissociation energy as compared to that of C-F bond is :

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stronger σ bond between B and F in BF3 as compared to that between C and F in CF4

significant pπ‐pπ interaction between B and F in BF3 whereas there is no probability of such interaction between C and F in CF4

lower degree of pπ‐pπ interaction between B and F in BF3 than that between C and F in CF4.

smaller size of B-atom as compared to that of C-atom

answer is B.

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Detailed Solution

F atom of BF3 shows pπ‐pπ back bonding with electron deficient B-atom.

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