Question

How to find bonding molecular orbital and anti bonding molecular orbital?

Answer 1

★ Bonding and antibonding molecular orbitals:-

• There are two types:-

→ σ and π bonding molecular orbital.

→ σ* and π* antibonding molecular orbitals.

★ Remember:-

• Bonding MO has large electron density above and below the inter molecular axis.

→ π* antibonding MO has a node between the nuclei.

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• Bond order:-

→ Bond order defines as half of the difference between the number of electrons in the bonding molecular orbitals and the number of electrons in the antibonding molecular orbitals.

• Bond order = ½ [Nb - Na]

Answer 2

BMO:-

Here wave function are added.

Electron density is more

attraction is present

Constructive interference

Doesn't have nodal plane

Energy of BMO is less

Electron placed in a BMO stabilise a molecule.

ABMO:-

Wave function is subtracted

Electron density is less

repulsion is present

Destructive interference

Have nodal plane between nuclei of bonded atom

Energy is high

Destabilizes the molecule