Which one of the following has no unpaired electrons?

O_{2}

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{O_{2}}^{-}

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{O_{2}}^{+}

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{O_{2}}^{2 -}

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Solution

The correct option is D ${O_{2}}^{2 -}$
$O_{2}^{- -}$ has NO unpaired electrons. It has MO configuration of $K K (σ 2 s)^{2} (σ^{} 2 s)^{2} (σ 2 p x)^{2} (π 2 p y)^{2} (π 2 p z)^{2} (π^{} 2 p y)^{2} (π^{*} 2 p z)^{2}$
$O_{2}$ , $O_{2}^{-}$ and $O_{2}^{+}$ have 2, 1 and 1 unpaired electrons respectively.

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