First slide

13th group or boron group

Question

B-F bond order in $B F_{3}$ is ____?

Moderate

A

1
B

2
C

3
D

4/3

Solution

The extent of back bonding in $B F_{3}$ is very significant. This is comparable with a regular $π$ bond. Following are their resonating structures.
$B o n d o r d e r = \frac{N o . o f b o n d s . i n a n y o n e r e s o n a t i n g s t r u c t u r e}{T o t a l N o . o f r e s o n a t i n g s t r u c t u r e s d u e t o b a c k b o n d i n g} = \frac{4}{3}$

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