Among (i) [Cr(en)_{3}]^{3+},(ii) trans-[Cr(en | vedclass

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(B) Optically active complexes are those that possess non-superimposable mirror images,which occurs when the complex lacks a plane of symmetry or a ce

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$(i)$ and $(iii)$

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(B) Optically active complexes are those that possess non-superimposable mirror images,which occurs when the complex lacks a plane of symmetry or a center of inversion.$1$. $[Cr(en)_{3}]^{3+}$: This is of the type $[M(AA)_{3}]$. It lacks a plane of symmetry and is optically active.$2$. $trans-[Cr(en)_{2}Cl_{2}]^{+}$: This is of the type $trans-[M(AA)_{2}X_{2}]$. It has a plane of symmetry and is optically inactive.$3$. $cis-[Cr(en)_{2}Cl_{2}]^{+}$: This is of the type $cis-[M(AA)_{2}X_{2}]$. It lacks a plane of symmetry and is optically active.$4$. $[Co(NH_{3})_{4}Cl_{2}]^{+}$: This is of the type $[MA_{4}B_{2}]$. It has a plane of symmetry and is optically inactive.Therefore,$(i)$ and $(iii)$ are the optically active complexes. The correct option is $B$.

Among $(i)$ $[Cr(en)_{3}]^{3+}$,$(ii)$ $trans-[Cr(en)_{2}Cl_{2}]^{+}$,$(iii)$ $cis-[Cr(en)_{2}Cl_{2}]^{+}$,$(iv)$ $[Co(NH_{3})_{4}Cl_{2}]^{+}$,the optically active complexes are:

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