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  4. Which of the following has the minimum bond length?

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Q. Which of the following has the minimum bond length?

AIPMTAIPMT 2011Chemical Bonding and Molecular Structure

Solution:

Bond order of $O _{2}^{+}=\frac{10-5}{2}=2.5$
Bond order of $O _{2}^{-}=\frac{10-7}{2}=1.5$
Bond order of $O _{2}^{2-}=\frac{10-8}{2}=1$
Bond order of $O _{2}=\frac{10-6}{2}=2$
$\because$ Maximum bond order = minimum bond length.
$\therefore$ Bond length is minimum for $O _{2}^{+}$