The IUPAC name for the complex $\left[\mathrm{Co}\left(\mathrm{NO}_2\right)\left(\mathrm{NH}_3\right)_5\right] \mathrm{Cl}_2$ is

• A

  nitrito-N-pentaamminecobalt (III) chloride
• B

  nitrito-N-pentaamminecobalt (II) chloride
• C

  pentaammine nitrito- $\mathrm{N}$-cobalt (II) chloride
• Correct answer
  D

  pentaammine nitrito- $\mathrm{N}$-cobalt (III) chloride

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