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Question: Answered & Verified by Expert
Which one of the following is expected to exhibit optical isomerism? $(\mathrm{en}=$ ethylenediamine)
ChemistryCoordination CompoundsNEETNEET 2005
Options:
  • A cis- $\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_2 \mathrm{Cl}_2\right]$
  • B trans-[ $\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_2 \mathrm{Cl}_2\right]$
  • C cis- $\left[\mathrm{Co}(e n)_2 \mathrm{Cl}_2\right]^{+}$
  • D trans-[ $\left[\mathrm{Co}(e n)_2 \mathrm{Cl}_2\right]^{+}$
Solution:
1163 Upvotes Verified Answer
The correct answer is: trans-[ $\left[\mathrm{Co}(e n)_2 \mathrm{Cl}_2\right]^{+}$
Trans $\left[\mathrm{Co}(e n)_2 \mathrm{Cl}_2\right]^{+}$is able to exhibit the phenomenon of optical isomerism because it can form a superimposable mirror image.


Related Theory
The foremost criteria to exhibit the optical isomerism is that the molecule should be dissymmetric i.e. the molecule should not be superimposed on its mirror image. The dissymmetry results from the presence of a chiral carbon atom.

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