Bond order and magnetic behaviour of mathrm{O}_{2}^{-} ion are, respectively:

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4.Chemical Bonding and Molecular Structure

easy

The bond order and magnetic behaviour of $\mathrm{O}_{2}^{-}$ion are, respectively:

$1.5$ and paramagnetic

$1.5$ and diamagnetic

$2$ and diamagnetic

$1$ and paramagnetic

(JEE MAIN-2021)

Solution

$\mathrm{O}_{2}^{-}=\left(\sigma_{1 \mathrm{~s}}\right)^{2}\left(\sigma_{1 \mathrm{~s}}^{*}\right)^{2}\left(\sigma_{2 \mathrm{~s}}\right)^{2}\left(\sigma_{2 \mathrm{~s}}^{*}\right)^{2}\left(\sigma_{2 \mathrm{p}_{\mathrm{z}}}\right)^{2}$

$\left(\pi_{2 \mathrm{p}_{\mathrm{x}}}^{2}=\pi_{2 \mathrm{p}_{\mathrm{y}}}^{2}\right)\left(\pi_{2 \mathrm{p}_{\mathrm{x}}}^{*_{2}}=\pi_{2 \mathrm{p}_{\mathrm{y}}}^{*_{1}}\right)$

$\text { Bond order }=\frac{10-7}{2}=1.5$

and paramagnetic

Standard 11

Chemistry