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Which of the following pairs represent linkage isomers?

1. [Pd(PPh3)2(NCS)2] and [Pd(PPh3)2(SCN)2]
2. [Co(NH3)5NO3]SO4 and [Co(NH3)5SO4]NO3
3. [PtCl2(NH3)4]Br2 and [PtBr2(NH3)4]Cl2
4. [Cu(NH3)4][PtCl4] and [Pt(NH3)4][CuCl4]

Correct answer: [Pd(PPh3)2(NCS)2] and [Pd(PPh3)2(SCN)2]

Solution

The correct option represents linkage isomers because the two compounds differ in the way the thiocyanate ligand is bonded to the metal center; one is bonded through the sulfur atom (NCS) while the other is bonded through the nitrogen atom (SCN), resulting in distinct chemical properties.

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