ABC26IN0054 · Chemical Bonding

Subject: Inorganic Chemistry · Chapter: Chemical Bonding · Topic: Chemical Bonding – General · Exam: CSIR-NET JUNE 2011 · Marks: 2 · Difficulty: Easy

The highest occupied MO in $\mathrm{N_2}$ and $\mathrm{O_2^{+}}$ respectively are (take x-axis as internuclear axis)
(a)$\sigma_{2px}$ , $\pi^{*}_{2py}$
(b)$\pi_{2 \mathrm{py}}, \pi_{2 \mathrm{pz}}$
(c)$\sigma^{*}{ }_{2 p x}, \sigma_{2 p x}$
(d)$\pi^{*}{ }_{2 \mathrm{py}}, \pi^{*}{ }_{2 \mathrm{pz}}$
Answer
Answer (as printed): A
Explanation
Taking x-axis as internuclear axis.
\[ \mathrm{N_2} = \sigma_{1s}^{2}\, \sigma_{1s}^{*2}\, \sigma_{2s}^{2}\, \sigma_{2s}^{*2}\, \pi_{2py}^{2}\, \pi_{2pz}^{2}\, \sigma_{2px}^{2} \]
\[ \mathrm{O_2^{+}} = \sigma_{1s}^{2}\, \sigma_{1s}^{*2}\, \sigma_{2s}^{2}\, \sigma_{2s}^{*2}\, \pi_{2px}^{2}\, \pi_{2py}^{2}\, \sigma_{2px}^{2}\, \pi_{2pz}^{*1}\, \pi_{2py}^{*1} \]

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