In which pair or pairs is the stronger bond found in the first species?
$I : O_{2}^{2 -}, O_{2}$ ; $I I : N_{2}, N_{2}^{+}$ ; $I I I : N O^{+}, N O^{-}$

I only

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II only

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I and III only

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II and III only

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Solution

The correct option is B II and III only
Bond strength is proportional to bond order.Following are the bond orders: $O_{2}^{-} = 1.5$ and $O_{2} = 2 N_{2} = 3$ and $N_{2}^{+} = 2.5$ ${N O}^{+} = 2.5$ and ${N O}^{-} = 1.5$

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