Type of isomerism Pair of examples
A) Ionization a) [Pt(NH₃)₃Cl]₂[PtCl₄] & [Pt(NH₃)₂Cl₂]
B) Linkage b) [Cr(NH₃)₆][Co(CN)₆] & [Co(NH₃)₆][Cr(CN)₆]
C) Coordination c) [Co(NH₃)₅(NO₂)] Cl₂ & [Co(NH₃)₅(ONO)]Cl₂
D) Polymerization d) [Co(SO₄)(NH₃)₅]Br & [Co(Br)(NH₃)₅] SO₄

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A B C D
d c b a

A B C D
b a d c

A B C D
a b c d

A B C D
d b c a

answer is C.

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Detailed Solution

Coordination isomerism occurs in compounds containing complex anionic and complex cationic parts and can be viewed as an interchange of some ligands from the cation to the anion. As a result, two complicated chemicals that have opposite charges—one negative and the other positive—are linked together.
Two compounds with the same elemental content but different molecular weights are said to exhibit polymerization isomerism.
Linkage isomers are two or more coordination compounds with at least one ligand that differs in the donor atom. Only compounds with ligands that can form two distinct bonds with the metal atom can exhibit this kind of isomerism.
Ionization isomers are identical except for a ligand that has exchanged places with an anion or neutral molecule that was originally outside the coordination complex. The central ion and the other ligands are the same.

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