How many ions of the following have a bond order of $2.5 ?$
$N_2^{-} ; NO^{-} ; C_2^{-} ; N_2^{+} ; C_2^{2-} ; CN^{+}$

  • A
    $4$
  • B
    $3$
  • C
    $2$
  • D
    $5$

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