Which of the following complexes does not sho | vedclass

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(D) Optical isomerism is shown by complexes that lack a plane of symmetry or center of inversion (i.e.,they are chiral).$1$. $[Cr(C_2O_4)_3]^{3-}$ is

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$[Cr(NH_3)_4SO_4]^+$

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(D) Optical isomerism is shown by complexes that lack a plane of symmetry or center of inversion (i.e.,they are chiral).$1$. $[Cr(C_2O_4)_3]^{3-}$ is an octahedral complex of the type $[M(AA)_3]$,which is chiral and shows optical isomerism.$2$. $Cis-[Pt(Br)_2(en)_2]^{2+}$ is an octahedral complex of the type $Cis-[M(AA)_2X_2]$,which lacks a plane of symmetry and shows optical isomerism.$3$. $[CrCl_2(NH_3)_2en]^+$ exists in various geometric isomers,and the specific isomer with the correct arrangement (lacking symmetry) shows optical isomerism.$4$. $[Cr(NH_3)_4SO_4]^+$ is an octahedral complex of the type $[M(NH_3)_4(SO_4)]^+$. This complex possesses a plane of symmetry (the plane containing the $SO_4$ ligand and the two trans $NH_3$ ligands),making it achiral. Therefore,it does not show optical isomerism.

Which of the following complexes does not show optical isomerism?

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