The correct order of energies of molecular orbitals of N2 molecule, is
The correct order of energies of molecular orbitals of N2 molecule, is
σ1s<σ*1s<σ2s<σ*2s<σ2pz<(π2px =π2py)<(π*2px=π*2py)<σ*2pz
σ1s<σ*1s<σ2s<σ*2s<σ2pz<σ*2pz<(π2px=π2py)<(π*2px=π*2py)
σ1s<σ*1s<σ2s<σ*2s<(π2px=π2py)<(π*2px=π*2py)<σ2pz<σ*2pz
σ1s<σ*1s<σ2s<σ*2s<(π2px=π2py)<σ2pz<(π*2px=π*2py)<σ*2pz
The Correct Option is D
Solution and Explanation
- The molecular orbitals are arranged in increasing energy levels.
- The σ1s orbital is the lowest in energy as it is the bonding molecular orbital formed by the overlap of two 1s atomic orbitals.
- The σ*1s orbital is the next in energy, representing the antibonding orbital formed by the out-of-phase overlap of two 1s atomic orbitals.
- The σ2s orbital is lower in energy than the σ*2s orbital, as the σ2s is formed by the overlap of two 2s atomic orbitals.
- The (π2px = π2py) orbitals are degenerate and have the same energy level. These are the bonding and antibonding π molecular orbitals formed by the overlap of two 2px and 2py atomic orbitals.
- The σ2pz orbital is lower in energy than the (π2px = π2py) orbitals, as the σ2pz is formed by the overlap of two 2pz atomic orbitals.
- Finally, the (π2px = π2py) orbitals are the highest in energy among these molecular orbitals.
Therefore, The correct option is (D): σ1s<σ*1s<σ2s<σ*2s<(π2px=π2py)<σ2pz<(π*2px=π*2py)<σ*2pz
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Concepts Used:
Molecular Orbital Theory
The Molecular Orbital Theory is a more sophisticated model of chemical bonding where new molecular orbitals are generated using a mathematical process called Linear Combination of Atomic Orbitals (LCAO).
Molecular Orbital theory is a chemical bonding theory that states that individual atoms combine together to form molecular orbitals. Due to this arrangement in MOT Theory, electrons associated with different nuclei can be found in different atomic orbitals. In molecular orbital theory, the electrons present in a molecule are not assigned to individual chemical bonds between the atoms. Rather, they are treated as moving under the influence of the atomic nuclei in the entire molecule.
