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 < σ2s < σ2pz < (π2p_x = π₂py ) < (π2p_x = π* 2p_y) < σ* 2p_z

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:

(π2p_y ) < (σ2pz ) < (π* 2px) ≈ (π* 2p_y)

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