The number of possible isomers of an octahedral complex $\left[\mathrm{Co}\left(\mathrm{C}_2 \mathrm{O}_4\right)_2\left(\mathrm{NH}_3\right)_2\right]^{-}$is

• A

  1
• B

  2
• Correct answer
  C

  3
• D

  4 .

Solution

$\left[\mathrm{Co}\left(\mathrm{C}_2 \mathrm{O}_4\right)_2\left(\mathrm{NH}_3\right)_2\right]^{-}$

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