NEET 2004 Chemistry question

Which of the following coordination compounds would exhibit optical isomerism :-

(1)Diamminedichloroplatinum (II)
(2)Trans-dicyanobis (ethylenediamine) chromium (III) chloride
(3)Tris (ethylenediamine) cobalt (III) bromideCorrect
(4)Pentaamminenitrocobalt (III) iodide

Answer: (3)

Solution

Optical isomerism requires a chiral complex (no plane or centre of symmetry). is an octahedral complex with three bidentate ligands, like a three-bladed propeller; it has no plane of symmetry and exists as a pair of non-superimposable mirror images

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Question ID VK-089428