| (i) \[[Cr{{(N{{H}_{3}})}_{6}}][Cr{{(CN)}_{6}}]\] and \[[Cr{{(N{{H}_{3}})}_{6}}][Cr{{(CN)}_{6}}]\]are coordination isomers. |
| (ii) \[[Cr{{(py)}_{2}}{{({{H}_{2}}O)}_{2}}C{{l}_{2}}]Cl\] and \[[Cr{{(py)}_{2}}{{({{H}_{2}}O)}_{2}}C{{l}_{3}}]{{H}_{2}}O\] are lig and isomers. |
| (iii) \[[Pt{{(N{{H}_{3}})}_{4}}B{{r}_{4}}]C{{l}_{2}}\] and \[[Pt{{(N{{H}_{3}})}_{4}}C{{l}_{2}}]B{{r}_{4}}\], are linkage isomers. |
| (iv) \[[NiC{{l}_{2}}{{(P\,P{{h}_{3}})}_{2}}]\] (tetrahedral) exhibits geometrical isomerism. |
A) (i) only
B) (i) and (ii)only
C) (ii) and (iii) only
D) (iii) and (iv) only
Correct Answer: A
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) lonisation isomerism occurs when the counter ion in a coordinaton compound is itself a potential ligand and can displace a ligand which can then become the counter ion. (iv) \[[NiC{{l}_{2}}\,{{(PP{{h}_{3\grave{\ }}})}_{2}}]\] 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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