In which of the following molecules, \sigma 2p_{z} molecular orbital is filled after \pi 2p_{x}  and \pi 2p_{y} molecular orbitals?
(i) O_{2}
(ii) Ne_{2}
(iii) N_{2}
(iv) F_{2}

Answers (1)

The answer is the option (iii) N2

The first atomic orbitals on two atoms form two molecular orbitals designated as

\sigma 1s\; and\; \sigma ^{*}1s

Similarly, the 2s and 2p atomic orbitals give rise to the eight molecular orbitals given below

Antibonding MOs\; \sigma^{*}2s\; \sigma^{*}2p_{z}\pi ^{*}2p_{x}\; \pi ^{*}2p_{y}

Bonding Mos\; \sigma 2s\; \sigma2p_{z}\; \pi 2p_{x}\; \pi 2p_{y}

For molecules such as B2, C2, N2, etc. it is observed that the increasing order of energies of various molecular orbitals is -

Here, the important characteristic feature is that energy of \sigma 2p_{z} molecular orbital is higher than that of \pi 2p_{x} and \pi 2p_{y} molecular orbitals

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