NEETChemistryCoordination Compounds
Which of the following pairs of coordination compounds is incorrectly matched with its type of structural isomerism?
Options
- A[ Pt ( NH ₃ )₄ ] [ CuCl ₄ ] and [ Cu ( NH ₃ )₄ ] [ PtCl ₄ ] : Coordination isomerism
- B[ Cr ( H ₂ O )₆ ] Cl ₃ and [ Cr ( H ₂ O )₅ Cl ] Cl ₂ H ₂ O : Solvate isomerism
- C[ Co ( NH ₃ )₅ Br ] SO ₄ and [ Co ( NH ₃ )₅ SO ₄ ] Cl : Ionisation isomerism
- D[ Co ( NH ₃ )₅ ( NO ₂ ) ] Cl ₂ and [ Co ( NH ₃ )₅ ( ONO ) ] Cl ₂ : Linkage isomerism
Correct answer
C. [ Co ( NH ₃ )₅ Br ] SO ₄ and [ Co ( NH ₃ )₅ SO ₄ ] Cl : Ionisation isomerism
Step-by-step solution
Isomers must have the identical molecular formula. In the pair [ Co ( NH ₃ )₅ Br ] SO ₄ and [ Co ( NH ₃ )₅ SO ₄ ] Cl , the first compound contains a bromide ion while the second contains a chloride ion. Since their molecular formulas are different, they are not isomers of each other at all, making this the incorrect match. The other pairs are correctly matched: [ Pt ( NH ₃ )₄ ] [ CuCl ₄ ] and [ Cu ( NH ₃ )₄ ] [ PtCl ₄ ] exhibit coordination isomerism (exchange of ligands between complex cation and complex anion). [