Among the complex ions,[Co(en)_2Cl_2]^{+},[Cr | vedclass

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(D) $1$. $[Co(en)_2Cl_2]^{+}$: This is of the type $[M(AA)_2a_2]$,which shows cis-trans isomerism.$2$. $[CrCl_2(C_2O_4)_2]^{3-}$: This is of the type

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$5$

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(D) $1$. $[Co(en)_2Cl_2]^{+}$: This is of the type $[M(AA)_2a_2]$,which shows cis-trans isomerism.$2$. $[CrCl_2(C_2O_4)_2]^{3-}$: This is of the type $[M(AA)_2a_2]$,which shows cis-trans isomerism.$3$. $[Fe(H_2O)_4(OH)_2]^{+}$: This is of the type $[Ma_4b_2]$,which shows cis-trans isomerism.$4$. $[Fe(NH_3)_2(CN)_4]^{-}$: This is of the type $[Ma_4b_2]$,which shows cis-trans isomerism.$5$. $[Co(en)_2(NH_3)Cl]^{2+}$: This is of the type $[M(AA)_2ab]$,which shows cis-trans isomerism.$6$. $[Co(NH_3)_4(H_2O)Cl]^{2+}$: This is of the type $[Ma_4bc]$. It shows geometrical isomerism,but specifically,it does not have a 'cis-trans' pair in the same sense as the others (it has facial/meridional or specific geometric arrangements,but is often excluded from the simple cis-trans definition).Thus,there are $5$ complex ions that show cis-trans isomerism.

Among the complex ions,$[Co(en)_2Cl_2]^{+}$,$[CrCl_2(C_2O_4)_2]^{3-}$,$[Fe(H_2O)_4(OH)_2]^{+}$,$[Fe(NH_3)_2(CN)_4]^{-}$,$[Co(en)_2(NH_3)Cl]^{2+}$ and $[Co(NH_3)_4(H_2O)Cl]^{2+}$,the number of complex ion$(s)$ that show$(s)$ cis-trans isomerism is

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