Assertion : The oxygen-oxygen bond length in peroxide ion ( O₂²⁻ ) is greater than that in superoxide ion ( O₂^- ). Reason : The bond order of peroxide ion is lower than that of superoxide ion.

Step-by-step solution

The number of electrons in superoxide ion O₂^- is 17 . The molecular orbital electronic configuration of O₂^- is _ 1s ^2 ^ * _ 1s ^2 _ 2s ^2 ^ * _ 2s ^2 _ 2p_z ^2 _ 2p_x ^2 _ 2p_y ^2 ^ * _ 2p_x ^2 ^ * _ 2p_y ^1 . Bond order of O₂^- = 10 - 7 2 = 1.5 . The number of electrons in peroxide ion O₂²⁻ is 18 . The molecular orbital electronic configuration of O₂²⁻ is _ 1s ^2 ^ * _ 1s ^2 _ 2s ^2 ^ * _ 2s ^2 _ 2p_z ^2 _ 2p_x ^2 _ 2p_y ^2 ^ * _ 2p_x ^2 ^ * _ 2p_y ^2 . Bond order of O₂²⁻ = 10 - 8 2 = 1 . Since bond length is i