Which of the following complex species is
Question:

Which of the following complex species is not expected to exhibit optical isomerism ?

1. $\left[\mathrm{Co}(\mathrm{en})_{3}\right]^{3+}$

2. $\left[\mathrm{Co}(\mathrm{en})_{2} \mathrm{Cl}_{2}\right]^{+}$

3. $\left[\mathrm{Co}\left(\mathrm{NH}_{3}\right)_{3} \mathrm{Cl}_{3}\right]$

4. $\left[\mathrm{Co}(\mathrm{en})\left(\mathrm{NH}_{3}\right)_{2} \mathrm{Cl}_{2}\right]^{+}$

Correct Option:

Solution:

Solution not required