The bond dissociation energy of B-F in BF_3 is 646 ~kJ mol ^ -1...

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1. Asmaller size of B-atom as compared to that of C-atom
2. Bstronger $\sigma$ bond between $\mathrm{B}$ and $\mathrm{F}$ in $\mathrm{BF}_3$ as compared to that between $\mathrm{C}$ and $\mathrm{F}$ in $\mathrm{CF}_4$
3. Csignificant $\mathrm{p} \pi-\mathrm{p} \pi$ interaction between $\mathrm{B}$ and $\mathrm{F}$ in $\mathrm{BF}_3$ whereas there is no possibility of such interaction between $\mathrm{C}$ and $\mathrm{F}$ in $\mathrm{CF}_4$.
4. Dlower degree of $\mathrm{p} \pi-\mathrm{p} \pi$ interaction between $\mathrm{B}$ and $\mathrm{F}$ in $\mathrm{BF}_3$ than that between $\mathrm{C}$ and $\mathrm{F}$ in $\mathrm{CF}_4$.