In which of the following transformations, the bond order has increased and the magnetic behaviour has changed ?

  • A

    $C_2^+\to C_2$

  • B

    $NO^+\to NO$

  • C

    $O_2\to O_2^+$

  • D

    $N_2\to N_2^+$

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  • [IIT 2007]

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