Which of the following complex species is

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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