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Question

Which of the following represents the correct order of filling the molecular orbitals of B2,C2 and N2 ?

A
π2px=π2py<σ2pz<π2px=π2py<σ2pz
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B
σ2pz<π2px=π2py<π2px=π2py<σ2pz
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C
σ2pz=π2px=π2py<π2px=π2py<σ2pz
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D
π2px<π2py=σ2pz>π2py<π2pz=σ2pz
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Solution

The correct option is A π2px=π2py<σ2pz<π2px=π2py<σ2pz
According to the modified modern concept, the energy of molecular orbitals increases in the order (number of electrons < 14)
σ1s<σ1s<σ2s<σ2s<π2px=π2py<σ2pz<π2px=π2py<σ2pz

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