NTA Abhyas JEE Main2020ChemistryChemical Bonding and Molecular StructurePractice
Which of the following is the correct prediction about observed B − F bond length in BF 3 molecule?
Options
- AB − F bond length in BF 3 is found to be less than theoretical value because the electronegativity values of B
- BBF 3 and BF 4 − have equal B − F bond length.
- CThe decrease in the B − F bond length in BF 3 is due to delocalised p π - p π bonding between vacant 2 p orbit
- DThe correct B − X bond length order is B − F > B − Cl > B − Br > B −
Correct answer
C. The decrease in the B − F bond length in BF 3 is due to delocalised p π - p π bonding between vacant 2 p orbit
Step-by-step solution
It has partial double character in B − F bond due to p π - p π back bonding.