Question

H.O.M.O (Highest Occupied Molecular Orbital) of CO molecular is:

• A. Non-bonding M.O. with slight antibonding character
• B. Non-bonding M.O. with slight bonding character
• C. Pure non-bonding M.O
• D. None of the above

Answer 1

The correct option is B Non-bonding M.O. with slight bonding character

Two atoms come together and interact to form a bond. The atomic orbitals mix together to form a new orbital. The new orbitals formed are called molecular orbitals. Molecular orbitals are formed by atomic orbitals having the same energy levels and symmetry. When molecular orbits are formed, atomic orbitals lose their identity. Every electron in the molecular orbits belongs to all the nuclei of the molecules. The number of molecular orbitals formed is equal to the number of atomic orbitals mixed. Molecular orbitals have orbitals are bonding, anti-bonding and non-bonding. Bonding molecular orbitals are lower in energy than anti-bonding orbitals. Each molecular orbital can be defined by a wave function which is associated with a set of quantum number. Electrons that are filled up in these orbitals according to Aufbau, Hunds and Pauli principle.

The highest occupied molecular orbital of CO is a molecular orbital which puts significant electron density on the carbon atom. The lowest unoccupied molecular orbital of CO is pi orbitals. Non-boding molecular orbitals of CO molecule have a slight bonding character.