Identify the set containing isoelectronic species.

• A

  $\mathrm{N}_2, \mathrm{O}_2^{2-}, \mathrm{NO}^{+}$
• Correct answer
  B

  $\mathrm{N}_2, \mathrm{CO}, \mathrm{NO}^{+}$
• C

  $\mathrm{F}_2, \mathrm{O}_2^{2-}, \mathrm{N}_2$
• D

  $\mathrm{N}_2, \mathrm{O}_2^{2+}, \mathrm{C}_2$

Hence, the correct answer is option: 'B'.