AIIMS 2018 Chemistry Isomerism MCQ Question

Option D, [CoBrCl(H₂O)₄][Ag(CN)₂], demonstrates coordination isomerism because it consists of two different complexes: one with cobalt and the other with silver, allowing for the exchange of ligands between the cation and anion. In contrast, option A lacks optical isomerism as it does not have a chiral center; option B does not exhibit ionization isomerism since the ligands remain unchanged in their coordination environment; and option C cannot show geometrical isomerism because it has a tetrahedral geometry with no possibility for cis-trans arrangements. Understanding these distinctions is crucial in recognizing the types of isomerism in coordination compounds.