In which change bond order and number of unpaired $e^-$ both are increased

  • A

    $N_2  \to  N_2^{-2}$

  • B

    ${B_2} \to B_2^ - $

  • C

    $O_2^ -  \to O_2^{2 - }$

  • D

    $O_2^ -  \to {O_2}$

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