According to $MO$ theory, number of species/ions from the following having identical bond order is $.........$

$CN ^{-}, NO ^{+}, O _{2}, O _{2}^{+}, O _{2}^{2+}$

  • [JEE MAIN 2022]
  • A

    $2$

  • B

    $3$

  • C

    $4$

  • D

    $5$

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  • [AIPMT 2011]

The bond order of a molecule is given by