Which of the following has the minimum bond length?

Which of the following has the minimum bond length?
  1. $\mathrm{O}_2^{-}$
  2. $\mathrm{O}_2^{2-}$
  3. $\mathrm{O}_2$
  4. $\mathrm{O}_2^{+}$

Solution

Bond order of $\mathrm{O}_2^{+}=\frac{10-5}{2}=2.5$ Bond order of $\mathrm{O}_2^{-}=\frac{10-7}{2}=1.5$ Bond order of $\mathrm{O}_2^{2-}=\frac{10-8}{2}=1$ Bond order of $\mathrm{O}_2=\frac{10-6}{2}=2$ $\because$ Maximum bond order $=$ minimum bond length. $\therefore$ Bond length is minimum for $\mathrm{O}_2^{+}$

Asked in: NEET 2011 (Screening)

Practice more Chemical Bonding and Molecular Structure questions on Aicharya