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NEET CHEMISTRYCoordination CompoundsMedium

Question

The complex that does not exhibit optical isomerism is: (en = ethylenediamine)

A

[Co(en)2Cl2]+[\text{Co}(\text{en})_2\text{Cl}_2]^+

B

[Co(NH3)3Cl3][\text{Co}(\text{NH}_3)_3\text{Cl}_3]

C

[Co(en)Cl2(NH3)2]+[\text{Co}(\text{en})\text{Cl}_2(\text{NH}_3)_2]^+

D

[Co(en)3]3+[\text{Co}(\text{en})_3]^{3+}

Step-by-Step Solution

Optical isomerism is not shown by complexes that possess a plane of symmetry. The complex [Co(NH3)3Cl3][\text{Co}(\text{NH}_3)_3\text{Cl}_3] is of the type [Ma3b3][Ma_3b_3]. It exhibits geometrical isomerism, existing as facial (fac) and meridional (mer) isomers. Both of these isomers possess a plane of symmetry and are therefore achiral (optically inactive). On the other hand, octahedral complexes containing bidentate ligands like ethylenediamine (en), such as [Co(en)3]3+[\text{Co}(\text{en})_3]^{3+} or the cis-isomer of [Co(en)2Cl2]+[\text{Co}(\text{en})_2\text{Cl}_2]^+, lack a plane of symmetry and thus exhibit optical isomerism.

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Coordination Compounds. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYCoordination Compoundscomplexexhibitopticalisomerismethylenediamine

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