Question

The bond length the species $O_2,O_2^{+}$ and $O_2^{-}$ are in the order of

• A. $O_2^{+}>O_2>O_2^{-}$
• B. $O_2^{+}>O_2^{-}>O_2$
• C. $O_2>O_2^{+}>O_2^{-}$
• D. $O_2^{-}>O_2>O_2^{+}$

Answer 1

Answer: (A)

As bond order increases bond length decrease, the bond order of species are
$=\frac{\text{Number of bonding electron - Number of antibonding electron}}{2}$
For $O_2=\frac{1.-6}{2}=2;O_2^{+}=\frac{10-5}{2}=2.5$
$O_2^{-}=\frac{10-7}{2}=1.5$
So, bond order $O_2^{+}>O_2>O_2^{-}$ and bond length are $O_2^{+}>O_2>O_2^{-}$