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  4. The complexes [ PtCl 2( NH 3)4] Br 2 and [ PtBr 2( NH 3)4] Cl 2 are examples for isomerism

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Q. The complexes $\left[ PtCl _{2}\left( NH _{3}\right)_{4}\right] Br _{2}$ and $\left[ PtBr _{2}\left( NH _{3}\right)_{4}\right] Cl _{2}$ are examples for isomerism

J & K CETJ & K CET 2008Coordination Compounds

Solution:

Since the complexes $\left[ PtCl _{2}\left( NH _{3}\right)_{4}\right] Br _{2}$ and $\left[ PtBr _{2}\left( NH _{3}\right)_{4}\right] Cl _{2}$ have the same molecular formula but on ionisation they give different ions, they exhibit ionisation isomerism.
$\left[ PtCl _{2}\left( NH _{3}\right)_{4}\right] Br _{2} \rightleftharpoons\left[ PtCl _{2}\left( NH _{3}\right)_{4}\right]^{2+}+2 Br ^{-}$
$\left[ PtBr _{2}\left( NH _{3}\right)_{4}\right] Cl _{2} \rightleftharpoons\left[ PtBr _{2}\left( NH _{3}\right)_{4}\right]^{2+}+2 Cl ^{-}$