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JEE Main levelSingle correct optionDifficulty 2 of 3cb089

The correct order of the O-O bond lengths in $O X_{2} X^{+}$ , $O X_{2}$ , $O X_{2} X^{-}$ and $O X_{2} X^{2 -}$ is

A $O X_{2} X^{+} < O X_{2} < O X_{2} X^{2 -} < O X_{2} X^{-}$
B $O X_{2} < O X_{2} X^{+} < O X_{2} X^{-} < O X_{2} X^{2 -}$
C $O X_{2} X^{2 -} < O X_{2} X^{-} < O X_{2} < O X_{2} X^{+}$
D $O X_{2} X^{+} < O X_{2} < O X_{2} X^{-} < O X_{2} X^{2 -}$

Answer: D

Bond orders are 2.5, 2, 1.5 and 1 respectively. A higher bond order means a shorter bond, so the lengths increase in the order

O X_{2} X^{+} < O X_{2} < O X_{2} X^{-} < O X_{2} X^{2 -}

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