Which of the following complex species is not | vedclass

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(C) Optical isomerism is exhibited by complexes that lack a plane of symmetry or center of inversion.$1$. $[Co(en)_3]^{3+}$ is a tris-chelated complex

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$[CoCl_3(NH_3)_3]$

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(C) Optical isomerism is exhibited by complexes that lack a plane of symmetry or center of inversion.$1$. $[Co(en)_3]^{3+}$ is a tris-chelated complex and is chiral.$2$. $[CoCl_2(en)_2]^+$ exists as cis and trans isomers; the cis-isomer is chiral.$3$. $[CoCl_3(NH_3)_3]$ exists as facial $(fac)$ and meridional $(mer)$ isomers. Both isomers possess a plane of symmetry,hence they are achiral and do not exhibit optical isomerism.$4$. $[CoCl_2(en)(NH_3)_2]^+$ can exist in chiral forms depending on the arrangement of ligands.Therefore,$[CoCl_3(NH_3)_3]$ is the correct answer.

Which of the following complex species is not expected to exhibit optical isomerism?

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