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  • Which of the following statement is not correct from the view point of molecular orbital theory? (i) Be2 is not a stable molecule. (ii) He2 is not stable but He{_{2}}^{+} is expected to exist.

Which of the following statement is not correct from the view point of molecular orbital theory?
(i) Be2 is not a stable molecule.
(ii) He2 is not stable but He{_{2}}^{+} is expected to exist.
(iii) Bond strength of N2 is maximum amongst the homonuclear diatomic molecules belonging to the second period.
(iv) The order of energies of molecular orbitals in N2 molecule is

\sigma 2s<\sigma ^{*}2s<\sigma 2p_{z}<(\pi 2px=\pi 2pr)<(\pi ^{*}2px=\pi ^{*}2py)<\sigma ^{*}2pz

Answers (1)

The answer is the option (iv) The order of the energies of molecular orbitals in N2 is

\sigma 2s<\sigma ^{*}2s<\sigma 2p_{z}<(\pi 2px=\pi 2pr)<(\pi ^{*}2px=\pi ^{*}2py)<\sigma ^{*}2pz

 

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