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Chemistry Question on coordination compounds

Which of the following pairs of isomers is not correctly matched with its type of isomerism?

A

[Cr(NH3)6][Cr(CN)6][Cr(NH_{3})_{6}] [Cr(CN)_{6}] and [Cr(NH3)4(CN)2][Cr(NH3)2(CN)4]−[Cr(NH_{3} )_{4} (CN)_{2}] [Cr(NH_{3} )_{2}(CN)_{4}] - Coordination isomerism

B

[Co(NH3)5NO2]Cl2[Co(NH_{3} )_{5}NO_{2} ]Cl_{2} and [Co(NH3)5ONO]Cl2−[Co(NH_{3} )_{5}ONO]Cl_{2 } - Linkage isomerism

C

[Co(py)2(H2O)2Cl2]Cl[Co(py)_{2}(H_{2}O)_{2}Cl_{2}]Cl and [Co(py)2(H2O)Cl3]H2O−[Co(py)_{2}(H_{2}O)Cl_{3}]H_{2}O- Coordination isomerism

D

[Pt(NH3)4Br2]Cl2[Pt(NH_{3} )_{4} Br_{2} ]Cl_{2} and [Pt(NH3)4Cl2]Br2−[Pt(NH_{3} )_{4} Cl_{2 }]Br_{2}- Ionisation isomerism

Answer

[Co(py)2(H2O)2Cl2]Cl[Co(py)_{2}(H_{2}O)_{2}Cl_{2}]Cl and [Co(py)2(H2O)Cl3]H2O−[Co(py)_{2}(H_{2}O)Cl_{3}]H_{2}O- Coordination isomerism

Explanation

Solution

[Co(py)2(H2O)2Cl2]Cl[Co(py)_{2}(H_{2}O)_{2}Cl_{2}]Cl and [Co(py)2(H2O)Cl3]H2O[Co(py)_{2}(H_{2}O)Cl_{3}]H_{2}O show hydrate isomerism.