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Question

Which of the following statements is not correct from the view point of molecular orbital theory?

A
Be2 is not a stable molecule.
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B
He2 is not stable but He+2 is expected to exist.
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C
Bond strength of N2 is maximum amongst the homonuclear diatomic molecules belonging to the second period.
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D
The order of energies of molecular orbitals in N2 molecule is σ2s<σ2s<σ2pz<(π2px=π2py)<(π2px=π2py)<σ2pz
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Solution

The correct option is D The order of energies of molecular orbitals in N2 molecule is σ2s<σ2s<σ2pz<(π2px=π2py)<(π2px=π2py)<σ2pz
1. Be2 has bond order zero , so it is not stable molecule,
2. He2 has bond order zero and He+2 has bond order 1
3.Bond strength of N2 is maximum as the bond order is 3 that is maximum amongest the homonuclear diatomic molecules belonging to the the second period.
4.The correct order of the energy of molecular orbital forN2 is σ2s<σ2s<(π2px=π2py)<σ2pz<(π2px=π2py)<σ2pz
So the correct option is D.

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