Which one of the following is expected to exhibit optical isomerism? (en \(=\) ethylenediamine)

• A

  cis-[Pt(\(\left.\left(\mathrm{NH}_3\right)_2 \mathrm{Cl}_2\right]\)
• B

  trans-[Pt(\(\left.\left(\mathrm{NH}_3\right)_2 \mathrm{Cl}_2\right]\)
• Correct answer
  C

  cis- \(\left[\mathrm{Co}(\mathrm{en})_2 \mathrm{Cl}_2\right]\)
• D

  trans- \(\left[\mathrm{Co}(\mathrm{en})_2 \mathrm{Cl}_2\right]\)

Solution

Transform of \(\left[\mathrm{M}(\mathrm{AA})_2 \mathrm{a}_2\right]^{\mathrm{n} \pm}\) does not shows optical isomerism.

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