Which of the following can show coordination isomerism?
(i) $[C u {({N H}_{3})}_{4}] [P t {C l}_{4}]$ (ii) ${[F e {({N H}_{3})}_{6}]}_{2} {[P t {(C N)}_{6}]}_{3}$
(iii) $[C o {({N H}_{3})}_{6}] [C r {(C_{2} O_{4})}_{3}]$ (iv) $[P t {(e n)}_{3}] {({S O}_{4})}_{2}$

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Solution

Coordination isomerism is a form of structural isomerism in which the composition of the complex ion varies. In a coordination isomer the total ratio of ligand to metal remains the same, but the ligands attached to a specific metal ion change.
i) In $[C u {(N H_{3})}_{4}] [P t C l_{4}]$ complex , both anion and cation can be metal complex ions which yields an isomer and this type of isomerism is referred to as coordination isomerism.
conclusion: hence the first(i) complex will show the coordination isomerism.

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[C o {({N H}_{3})}_{6}] [C r {(C_{2} O_{4})}_{3}]

- [C o (N H_{3})_{4} C l_{2}]^{+}

- [C o (e n)_{2} C l_{2}]^{+}

- [C o (e n)_{2} C l_{2}]^{+}

[C o (e n)_{3}]^{3 +}

[F e F_{6}]^{3 -}

[C o (N H_{3})_{6}]^{3 +}

[N i C l_{4}]^{2 -}

[C u (N H_{3})_{4}]^{2 +}

[C o (H_{2} O) (C N) (e n)_{2}]^{2 +}

[C o B r_{2} (e n)_{2}]^{+}

[P t C l_{4}]^{2 -}

K_{3} [F e (C N)_{6}]

[C r (N H_{3})_{3} C l_{3}]

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