Question

The order of relative bond strength of oxygen molecule, superoxide ion and peroxide ion is

• A. $O _{2}< O _{2}^{-}< O _{2}^{2-}$
• B. $O _{2}> O _{2}^{-}> O _{2}^{2-}$
• C. $O _{2}< O _{2}^{-}> O _{2}^{2-}$
• D. $O _{2}> O _{2}^{-}< O _{2}^{2-}$

Answer 1

Answer: (B)

Bond strength depends on bond order. More is the bond order, more is the strength.

Species	Bond Order
$O_2$	$2$
$O_2^-$	$1.5$
$O_2^{2-}$	$1.0$

Hence, the order of bond strength is as : $O _{2}> O _{2}^{-}> O _{2}^{2-}$