The existence of two different coloured complexes with the composition of is due to:
linkage isomerism
geometrical isomerism
coordination isomerism
ionization isomerism
As we learned in concept
Geometrical Isomers -
This is due to the difference in relative position of the ligands attached to the central metal atom with respect to each other
-
displays geometrical isomerism in as and transforms. As form is purple in colour whereas trans form is green.
Therefore, colour difference is due to geometrical isomerism
Thereform, solution is 2
Option 1)
linkage isomerism
incorrect
Option 2)
geometrical isomerism
correct
Option 3)
coordination isomerism
incorrect
Option 4)
ionization isomerism
incorrect