Which of the following ligands is NOT a chelating agent?

The octahedral complex ${\mathrm{CoSO}}_4\mathrm{Cl}.5{\mathrm{NH}}_3$ exists in two isomeric forms, $\mathrm{X}$ and $\mathrm{Y}.$ Isomer X reacts with ${\mathrm{AgNO}}_3$ to give a white precipitate, but does not react with ${\mathrm{BaCl}}_2.$ Isomer $\mathrm{Y}$ gives a white precipitate with ${\mathrm{BaCl}}_2$, but does not react with ${\mathrm{AgNO}}_3.$ X and Y are:

$\mathrm{I}$. Ionisation

$\mathrm{II}$. Hydrate

$\mathrm{III}$. Coordination

$\mathrm{IV}$. Geometrical

$\mathrm{V}$. Optical

Which of the above isomerisms are exhibited by ${\left[\mathrm{Cr}{\left({\mathrm{NH}}_3\right)}_2{\left(\mathrm{OH}\right)}_2{\mathrm{Cl}}_2\right]}^{-1}$?