Chemistry - Coordination Chemistry Question with Solution | TestHub

Among the complex ions, ${\left[\mathrm{Co}{\left({\mathrm{NH}}_2-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{NH}}_2\right)}_2{\mathrm{Cl}}_2\right]}^{+},{\left[{\mathrm{CrCl}}_2{\left({\mathrm{C}}_2{\mathrm{O}}_4\right)}_2\right]}^{3-},{\left[\mathrm{Fe}{\left({\mathrm{H}}_2\mathrm{O}\right)}_4(\mathrm{OH}{)}_2\right]}^{+}$, ${\left[\mathrm{Fe}{\left({\mathrm{NH}}_3\right)}_2(\mathrm{CN}{)}_4\right]}^{-},{\left[\mathrm{Co}{\left({\mathrm{NH}}_2-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{NH}}_2\right)}_2\left({\mathrm{NH}}_3\right)\mathrm{Cl}\right]}^{2+}$ and ${\left[\mathrm{Co}{\left({\mathrm{NH}}_3\right)}_4\left({\mathrm{H}}_2\mathrm{O}\right)\mathrm{Cl}\right]}^{2+}$, the number of complex ion(s) that show(s) cis-trans isomerism is