Q. 19

Which of the following statement is not correct from the view point of molecular orbital theory?
A. Be2 is not a stable molecule.

B. He2 is not stable but He2 + is expected to exist.

C. Bond strength of N2 is maximum amongst the homonuclear diatomic molecules belonging to the second period.

D. The order of energies of molecular orbitals in N2 molecule is σ2s < σ*2s < σ2pz < (π2px = π2py ) < (π*2px = π* 2py) < σ* 2pz

Answer :

All the statements (i),(ii) and (iii) are correct

Statement (iv) is incorrect because according to the Molecular Orbital Theory the increasing order of orbitals in term of energy is:


(π2py ) < (σ2pz ) < (π* 2px) ≈ (π* 2py)

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