The concept used to solve bond order and stability of molecules is a molecular orbital theory. Firstly the molecular orbital diagram is drawn than bond order is calculated using the bonding and antibonding orbitals.
Bond Order:
It tells the number of chemical bonds between the atoms.
The bond order can be calculated by using the formula given below.
……(1)
Here,
is a number of electrons in bonding molecular orbital and
number of electrons in an antibonding molecular orbital.
The molecular mass of
is
. The molecular orbital configuration of
of increasing order of energy is shown below.


To calculate the bond order of
substitute the value of
as
and
as
in the equation (1).
![Bond order = [
[10 -8 ]
Bond order = 1](http://img.homeworklib.com/questions/d3b522c0-edd9-11eb-8afd-03183f241dc4.png?x-oss-process=image/resize,w_560)
To calculate the bond order of
substitute the value of
as
and
as
in the equation (1).
![Bond order = [10 - 7]
Bond order = 1.5](http://img.homeworklib.com/questions/d563c140-edd9-11eb-b0b7-bb1b1ba6ff7b.png?x-oss-process=image/resize,w_560)
To calculate the bond order of
substitute the value of
as
and
as
in the equation (1).

The bond order of
is
, which is the highest among all others.The most stable molecule is
.
The bond order of
is
.
The bond order of
is
.
The bond order of
is
.
The most stable molecule is
.
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