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Which of the following coordination compounds would exhibit optical isomerism?

1. pentamminenitrocobalt(III) iodide
2. diamminechloroplatinum(II)
3. trans-dicyano bis (ethylenediamine) chromium (III) chloride
4. tris-(ethylenediamine) cobalt (III) bromide

Correct answer: tris-(ethylenediamine) cobalt (III) bromide

Solution

Optical isomerism occurs in coordination compounds with chiral structures. Tris-(ethylenediamine) cobalt (III) bromide has a chiral geometry due to the three bidentate ethylenediamine ligands, making it optically active.

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