Q32 / 120 · NEET 2012 (Mains) · Chemistry

During change of $\mathrm{O}_2$ to $\mathrm{O}_2^{-}$ion, the electron adds on which one of the following orbitals?

  • Correct answer
    A
    $\pi^*$ orbital
  • B
    $\pi$ orbital
  • C
    $\widetilde{\circ}$ orbital
  • D
    $\sigma$ orbital

Solution

Electronic configuration of \(\mathrm{O}_2\) \(\begin{aligned} & \sigma(1 s)^2 \sigma^*(1 s)^2 \sigma(2 s)^2 \sigma^*(2 s)^2 \sigma\left(2 p_z\right)^2 \pi\left(2 p_x\right)^2=\pi\left(2 p_y\right)^2 \\ & \pi^*\left(2 p_x\right)^1=\pi^*\left(2 p_y\right)^1 \end{aligned}\) Thus, the incoming electron will enter in \(\pi^* 2 p_x\) to form \(\mathrm{O}_2\).

Hence, the correct answer is option: 'A'.

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