1.

The bond dissociation energy of B–F in BF_​3 is 646 kJ mol^(–1) whereas that of C-F in CF​_4 is 515 kJ mol^(–1). The correct reason for higher B-F bond dissociation energy ascompared to that of C-F is:-

Answer»

Significant `ppi-ppi` interaction between B and F in `BF_​3` whereas there is no possibility of such interaction between C and F in `CF_​4`​.
Lower DEGREE of `ppi-ppi` interaction between B and F in `BF_3` than that between C and F in `CF_4`
Smaller size of B atom as compared to that of C atom
STRONGER BOND between B and F in `BF_3`as compared to that between C and F in CF

SOLUTION :In `BF_3 .ppi-ppi` back bonding is present .


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