Question

The sequence that correctly describes the relative bond strength pertaining to oxygen molecule and its cation or anions is:

• A. $ O_{2}^{2-}>O_{2}^{-}>{{O}_{2}}>O_{2}^{+} $
• B. $ {{O}_{2}}>O_{2}^{+}>O_{2}^{-}>O_{2}^{2-} $
• C. $ O_{2}^{+}>{{O}_{2}}>O_{2}^{2-}>O_{2}^{-} $
• D. $ O_{2}^{+}>{{O}_{2}}>O_{2}^{-}>O_{2}^{2-} $
• E. $ {{O}_{2}}>O_{2}^{-}>O_{2}^{2-}>O_{2}^{+} $

Answer 1

Answer: (D)

Bond order of oxygen molecule = 2
Bond order of oxygen molecule ion =2.5
Bond order of superperoxide ion $ (O_{2}^{-})=1.5 $
Bond order of peroxide ion $ (O_{2}^{2-})=1 $
Hence, the order of bond strength is as: $ O_{2}^{+}>{{O}_{2}}>O_{2}^{-}>O_{2}^{2-} $