# What is the Bond Order of CO Molecule?

By BYJU'S Exam Prep

Updated on: September 25th, 2023

What is the Bond Order of CO Molecule? The bond order of CO is three. This bond is strongly polarized towards oxygen. The reactions that are formed with this bond are Williamson ether synthesis, electrophilic addition to alkenes, and nucleophilic acyl substitutions.

The bond order is calculated by subtracting the number of electrons in the antibonding orbitals from the number of electrons in the bonding orbitals and dividing the result by 2.

Table of content

## Bond Order of CO Molecule

Bond order is defined as the difference between the number of bonds and anti-bonds. For example, the bond number of diatomic nitrogen is three. It indicates the stability of a bond. The definition of bond order in molecular orbital theory is half the difference between the number of bonding electrons and the number of antibonding electrons. The concept of bond order is used in molecular dynamics and bond order potentials.

Solution

The bond order of CO is three. The bond order of a molecule is a measure of the number of chemical bonds between a pair of atoms. The carbon atom and the oxygen atom combine to create a double bond in carbon monoxide (CO). The σ bonding, σ antibonding, and π bonding molecular orbitals are all included in the CO molecular orbital diagram. The atomic orbitals that overlap along the internuclear axis produce the σ bonding and σ antibonding orbitals, but the p orbitals that overlap sideways produce the π bonding orbital.

The molecular orbital theory can be used to predict bond order. According to molecular orbital theory, bond order is equal to half of the difference between the number of electrons involved in bonding and antibonding.

Bond order = [Bonding Electrons – Antibonding Electrons]/2

The molecular orbital electronic arrangement of CO molecule is,

σ1s2 σ*1s2 σ2s2 σ*2s2 π2px2=π2py2 σ2pz2

Here, number of bonding electrons = 10 and number of antibonding electrons = 4

Therefore, the bond order of CO molecule is calculated as;

B.O. = [10-4]/2 = 6/2 = 3

Hence, the bond order of CO molecule is 3.

Summary

## What is the bond order of CO Molecule?

The bond order of CO is three. It can be derived from the molecular orbital theory. The bond order is a measure of the number of chemical bonds between two atoms in a molecule. It is calculated by taking the difference between the number of bonding electrons and the number of anti-bonding electrons, divided by 2. Generally, the higher the bond order, the strong the bond.

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