Select the correct statement

Options

A. `[Co(EDTA)]^(-)` has two optical isomers.
B. `[Co(NH_(3))_(5)(NO_(2))]^(2+)` show linkage isomerism
C. For `[Pt(NH_(3))BrClI(NO_(2))py]`, theroretically fifteen different geometrical isomers are possible .
D. `[Cr(H_(2)O)_(4)Cl_(2)]Cl_(2).2H_(2)O)` is an example of hydrate as well as ionisation isomerism.

Answer

A, B, C

Explanation

(A) `[Co(EDTA)]^(1)hArr` shows optical isomerism.
(B) `NO_(2)^(-)` being bidentate ligands can attach to central metal ion through N or O.
(C ) It is Mabcdef type and thus have fifteen different geometrical isomers.
(D) Ionisation isomerism involves exchange of different ions between coordination sphere and ionisation sphere. In complex `[Cr(H_(2)O)_(4)Cl_(2)]Cl_(2).2H_(2)O`, same anionic ligands, i.e., `Cl^(-1)` are present in coordination sphere and ionisation sphere , so no exchange of ions takes place.