The increasing order of bond order of $O_2, O_2^+, O_2^-$,and $O_2^{2-}$ is:

  • A
    $O_2^+, O_2, O_2^-, O_2^{2-}$
  • B
    $O_2^{2-}, O_2^-, O_2^+, O_2$
  • C
    $O_2, O_2^+, O_2^-, O_2^{2-}$
  • D
    $O_2^{2-}, O_2^-, O_2, O_2^+$

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