NTA Abhyas JEE Main2020ChemistryChemical Bonding and Molecular StructurePractice
The bond dissociation energy of B - F in B F 3 is 646 kJ mo l - 1 whereas that of C - F in C F 4 is 515 kJ mo l - 1 . The correct reason for higher B - F bond dissociation energy as compared to that of C - F is
Options
- Astronger σ bond between B and F in B F 3 as compared to that between C and F in C F 4
- Bsignificant p π - p π interaction between B and F in B F 3 whereas there is no possibility of such interaction
- Clower degree of p π - p π interaction between B and F B F 3 than that between C and F in C F 4
- Dsmaller size of B- atom as compared to that of C- atom
Correct answer
B. significant p π - p π interaction between B and F in B F 3 whereas there is no possibility of such interaction
Step-by-step solution
The bond dissociation energy of B - F in B F 3 is 646 kJ mo l - 1 whereas that of C - F in C F 4 is 515 kJ mo l - 1 due to significant p π - p π interaction between B and F in B F 3 whereas there is no possibility of such interaction between C and F in C F 4