Question

If an extra electron is added to the hypothetical molecule $C _{2}$, this extra electron will occupy the molecular orbital :-

• A. $\pi_{2 P}^{*}$
• B. $\pi_{2 P}$
• C. $\sigma_{2 P }^{*}$
• D. $\sigma_{2 P}$

Answer 1

Answer: (D)

Configuration of $C _{2}$
$\sigma_{18}^{2} \sigma^{* 2} _{1s} \sigma_{1s}^{2} \sigma_{2 s }^{* 2} \pi_{2 px }^{2}=\pi_{2 py }^{2} \sigma_{2 pz }$
an extra electron added to the $\sigma_{2 p }$ of the above configuration.