Which formula and its name combination is incorrect?

• A

  $\mathrm{K}_3\left[\mathrm{Cr}\left(\mathrm{C}_2 \mathrm{O}_4\right)_3\right]$, Potassium trioxalatochromate (III)
• B

  $\left[\mathrm{CoCl}_2(\mathrm{en})_2\right] \mathrm{Cl}$, Dichloridobis (ethane - 1,2 - dimine) cobalt (III) chloride
• Correct answer
  C

  $\left[\mathrm{Co}\left(\mathrm{NH}_3\right)_5\left(\mathrm{CO}_3\right)\right] \mathrm{Cl}$, Pentaamine carbonylcobalt (III) chloride
• D

  $\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_2 \mathrm{Cl}\left(\mathrm{NO}_2\right)\right]$ Diamine chloridonitrito $-\mathrm{N}-$ Platinum (II)

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