Question: Which of the following complex species is not expected to exhibit optical isomerism ?
$\left[\mathrm{Co}(\mathrm{en})_{3}\right]^{3+}$
$\left[\mathrm{Co}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right]^{+}$
$\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{3} \mathrm{Cl}_{3}\right]$
$\left[\mathrm{Co}(\mathrm{en})\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{2}\right]^{+}$
Correct Option:
Solution:
Solution not required
