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Chemistry Question on coordination compounds

The ionisation isomer of [Cr(H2O)4Cl(NO2)]Cl[Cr(H_2O )_4Cl(NO_2 )]Cl is

A

[Cr(H2O)4(O2N)]Cl2[Cr(H_2O )_4 (O_2N)]Cl_2

B

[Cr(H2O)4Cl2](NO2)[Cr(H_2O )_4 Cl_2 ](NO_2)

C

[Cr(H2O)4Cl(ONO)]Cl[Cr(H_2O)_4Cl(ONO)]Cl

D

[Cr(H2O)4Cl2(NO2)].H2O[Cr(H_2O )_4Cl_2(NO_2 )]. H_2O

Answer

[Cr(H2O)4Cl2](NO2)[Cr(H_2O )_4 Cl_2 ](NO_2)

Explanation

Solution

Ionisation isomers are the complexes that produces different ions in solution, i.e. they have ions interchanged inside and outside the coordination sphere. [Cr(H2O)4Cl(NO2)]Cl[Cr(H_2O)_4Cl(NO_2)]Cl and [Cr(H2O)4Cl2](NO2)[Cr(H_2O)_4Cl_2](NO_2) have different ions inside and outside the coordinate sphere and they are isomers.
Therefore, they are ionisation isomers.