Coordination CompoundHard
Question
Consider the following statements and select the correct option using the codes given.
(i) [Cr(NH3)6][Cr(CN)6] and [Cr(NH3)4(CN)2] [Cr(NH3)2(CN)4] are coordination isomers.
(ii) [Cr(py)2(H2O)2Cl2]Cl and [Cr(py)2(H2O)Cl3]H2O are ligand isomers.
(iii) [Pt(NH3)4Br2]Cl2 and [Pt(NH3)4Cl2]Br2 are linkage isomers.
(iv) [NiCl2(PPh3)2] (tetrahedral) exhibits geometrical isomerism.
(i) [Cr(NH3)6][Cr(CN)6] and [Cr(NH3)4(CN)2] [Cr(NH3)2(CN)4] are coordination isomers.
(ii) [Cr(py)2(H2O)2Cl2]Cl and [Cr(py)2(H2O)Cl3]H2O are ligand isomers.
(iii) [Pt(NH3)4Br2]Cl2 and [Pt(NH3)4Cl2]Br2 are linkage isomers.
(iv) [NiCl2(PPh3)2] (tetrahedral) exhibits geometrical isomerism.
Options
A.(i) only
B.(i) and (ii) only
C.(ii) and (iii) only
D.(iii) and (iv) only
Solution
(i) Coordination compounds made up of cationic and anionic coordination entities show coordination isomerism due to the interchange of ligands between the cation and anion entities.
(ii) Hydrate isomers differ by whether or not a water molecule is directly bonded to the metal ion or merely present as free water molecules in the crystal lattice.
(iii) Ionisation isomerism occurs when the counter ion in a coordination compound is itself a potential ligand and can displace a ligand which can then become the counter ion.
(iv) [NiCl2(PPh3)2] has tetrahedral geometry on account of the bulkier nature of triphenyl phosphine. In tetrahedral geometry all positions are adjacent to each other and therefore, does not show geometrical isomerism.
(ii) Hydrate isomers differ by whether or not a water molecule is directly bonded to the metal ion or merely present as free water molecules in the crystal lattice.
(iii) Ionisation isomerism occurs when the counter ion in a coordination compound is itself a potential ligand and can displace a ligand which can then become the counter ion.
(iv) [NiCl2(PPh3)2] has tetrahedral geometry on account of the bulkier nature of triphenyl phosphine. In tetrahedral geometry all positions are adjacent to each other and therefore, does not show geometrical isomerism.
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