[CoCl2(NH3)4]++Cl−⟶[CoCl3(NH3)3]+NH3 . If in this reaction two isomers of the product are obtained, which is true for the initial (reactant) complex :
(1) compound is in *cis*-form
(2) compound is in *trans*-form
(3) compound is in both (*cis* and *trans*) form
(4) can't be predicted