In which of the following pairs do both the c | vedclass

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(B) Optical isomerism is shown by complexes that lack a plane of symmetry and a center of inversion (i.e.,they are chiral).$1$. $[Co(en)_3]Cl_3$: This

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$[Co(en)_3]Cl_3$,$cis-[Co(en)_2Cl_2]Cl$

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(B) Optical isomerism is shown by complexes that lack a plane of symmetry and a center of inversion (i.e.,they are chiral).$1$. $[Co(en)_3]Cl_3$: This complex contains three bidentate ethylenediamine $(en)$ ligands. It exists as a pair of non-superimposable mirror images (enantiomers) and thus shows optical isomerism.$2$. $cis-[Co(en)_2Cl_2]Cl$: In the $cis$ isomer,the two $Cl$ ligands are adjacent. This configuration lacks a plane of symmetry,making it chiral and optically active.Therefore,both complexes in option $B$ exhibit optical isomerism.

List-$I$ (Complexes)	List-$II$ (Types)
$a$. $[Co(NH_3)_5NO_2]Cl_2$ and $[Co(NH_3)_5ONO]Cl_2$	$i$. Linkage isomerism
$b$. $[Cr(NH_3)_6][Co(CN)_6]$ and $[Cr(CN)_6][Co(NH_3)_6]$	$ii$. Coordination isomerism
$c$. $[Co(NH_3)_5(SO_4)]Br$ and $[Co(NH_3)_5Br]SO_4$	$iii$. Ionisation isomerism
$d$. $[Cr(H_2O)_6]Cl_3$ and $[Cr(H_2O)_5Cl]Cl_2 \cdot H_2O$	$iv$. Solvate isomerism

In which of the following pairs do both the complexes show optical isomerism?

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