MCQ
The bond order and magnetic behaviour of $\mathrm{O}_{2}^{-}$ion are, respectively:
- ✓$1.5$ and paramagnetic
- B$1.5$ and diamagnetic
- C$2$ and diamagnetic
- D$1$ and paramagnetic
✓
Answer
Correct option: A.
$1.5$ and paramagnetic
a
$\mathrm{O}_{2}^{-}=\left(\sigma_{1 \mathrm{~s}}\right)^{2}\left(\sigma_{1 \mathrm{~s}}^{*}\right)^{2}\left(\sigma_{2 \mathrm{~s}}\right)^{2}\left(\sigma_{2 \mathrm{~s}}^{*}\right)^{2}\left(\sigma_{2 \mathrm{p}_{\mathrm{z}}}\right)^{2}$
$\mathrm{O}_{2}^{-}=\left(\sigma_{1 \mathrm{~s}}\right)^{2}\left(\sigma_{1 \mathrm{~s}}^{*}\right)^{2}\left(\sigma_{2 \mathrm{~s}}\right)^{2}\left(\sigma_{2 \mathrm{~s}}^{*}\right)^{2}\left(\sigma_{2 \mathrm{p}_{\mathrm{z}}}\right)^{2}$
$\left(\pi_{2 \mathrm{p}_{\mathrm{x}}}^{2}=\pi_{2 \mathrm{p}_{\mathrm{y}}}^{2}\right)\left(\pi_{2 \mathrm{p}_{\mathrm{x}}}^{*_{2}}=\pi_{2 \mathrm{p}_{\mathrm{y}}}^{*_{1}}\right)$
$\text { Bond order }=\frac{10-7}{2}=1.5$
and paramagnetic
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