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Which of the following shows optical isomerism ?

1. [Co(en)(NH3)2]2+
2. [Co(H2O)4(en)]3+
3. [Co(en)2(NH3)2]3+
4. [Co(NH3)3Cl]+

Correct answer: [Co(en)2(NH3)2]3+

Solution

The complex [Co(en)2(NH3)2]3+ exhibits optical isomerism because it contains two bidentate ethylenediamine (en) ligands that create a chiral environment, allowing for non-superimposable mirror images. This characteristic is essential for optical isomerism, which is not present in the other complexes listed.

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