During the change of \(\mathrm{O_2}\) to \(\mathrm{O_2^-}\), the incoming electron goes to the orbital :
Show Hint
- \(\pi 2p_y\)
- \(\sigma^{*}2p_z\)
- \(\pi^{*}2p_x\)
- \(\pi 2p_x\)
The Correct Option is C
Solution and Explanation
The two \(\pi^*\) orbitals are singly occupied (making \(\mathrm{O_2}\) paramagnetic). The next electron enters one of these half-filled \(\pi^*\) orbitals, pairing up in \(\pi^*2p_x\) (or equivalently \(\pi^*2p_y\)), giving \(\mathrm{O_2^-}\) with \(\pi^*2p_x^2\,\pi^*2p_y^1\).
Among the options, \(\pi^*2p_x\) is the correct one.
Answer: (3) \(\pi^{*}2p_x\)
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