The complex $\left[\mathrm{PtCl}_2(\mathrm{en})_2\right]^{2+}$ ion shows

• A

  structural isomerism
• B

  geometrical isomerism only
• C

  optical isomerism only
• Correct answer
  D

  geometrical and optical isomerism

Solution

$\left[\mathrm{PtCl}_2(\mathrm{en})_2\right]^{2+}$ shows both geometrical and optical isomerism as the complex forms cis and trans isomers. trans-isomer doesn't show optical isomerism since it is symmetrical but cis-isomer shows optical isomerism as it is unsymmetrical.

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