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$[Pt{{(N{{H}_{3}})}_{4}}C{{l}_{2}}]B{{r}_{2}}$ and $[Pt{{(N{{H}_{3}})}_{4}}B{{r}_{2}}]C{{l}_{2}}$ are related to each other as [MP PET 1996; AFMC 2000; CBSE PMT 2001]
(A) Optical isomers
(B) Coordinate isomers
(C) Ionization isomers
(D) Linkage isomers

Answer
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Hint: Stereoisomers interconnected by non-superimposable mirror images of one another are known as optical isomers. The isomers known as coordination isomers are those in which the ligands of various metal ions present in the complex are changed between cationic and anionic entities. The interchange of ions inside and outside the coordination sphere is a characteristic of ionisation isomerism. When a compound has a ligand that has the ability to form two (or more) different bonds with the metal atom, linkage isomers are formed.

Complete answer:The interchange of ions inside and outside the coordination sphere is a component of ionisation isomerism. Ionization isomerism is the term used to describe how these isomers produce various ions in solution. Here, the two coordination complexes $[Pt{{(N{{H}_{3}})}_{4}}C{{l}_{2}}]B{{r}_{2}}$ and $[Pt{{(N{{H}_{3}})}_{4}}B{{r}_{2}}]C{{l}_{2}}$have the same composition and same molecular formula, but they differ in the fact that they give different ions in solution. $[Pt{{(N{{H}_{3}})}_{4}}C{{l}_{2}}]B{{r}_{2}}$gives two $B{{r}^{-}}$ions, whereas $[Pt{{(N{{H}_{3}})}_{4}}B{{r}_{2}}]C{{l}_{2}}$gives two $C{{l}^{-}}$ions in solution.
Thus, $[Pt{{(N{{H}_{3}})}_{4}}C{{l}_{2}}]B{{r}_{2}}$ and $[Pt{{(N{{H}_{3}})}_{4}}B{{r}_{2}}]C{{l}_{2}}$ are related to each other as ionisation isomers.

Correct Option: C) Ionization isomers

Note: The phenomenon known as isomerism occurs when many compounds with the same chemical formula but different chemical structures exist. There are two types of isomers: stereo and structural. The stereoisomers include geometric isomers and optical isomers. The structural isomers include chain isomers, position isomers, functional isomers, tautomers, ring-chain isomers, and metamers.