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Chemistry Question on coordination compounds

Which of the following pairs represents linkage isomers ?

A

[Cu(NH3)4][PtCl4]\left[Cu\left(NH_{3}\right)_{4}\right]\left[PtCl_{4}\right] and [Pt(NH3)4][CuCl4]\left[Pt\left(NH_{3}\right)_{4}\right]\left[CuCl_{4}\right]

B

[Pd(PPh3)2(NCS)2]\left[Pd\left(PPh_{3}\right)_{2}\left(NCS\right)_{2}\right] and [Pd(PPh3)2(SCN)2]\left[Pd\left(PPh_{3}\right)_{2}\left(SCN\right)_{2}\right]

C

[CO(NH3)5 (NO3)]SO4\left[CO\left(NH_{3}\right)_{5}\,(NO_{3})\right]SO_{4} and [CO(NH3)5 (SO4)]NO3\left[CO\left(NH_{3}\right)_{5}\,(SO_{4})\right]NO_{3}

D

[PtCl2(NH3)4]Br2 and [PtBr2(NH3)4]Cl2\left[PtCl_{2}\left(NH_{3}\right)_{4}\right]Br_{2} \,and\, [PtBr_{2}\left(NH_{3}\right)_4]Cl_{2}

Answer

[Pd(PPh3)2(NCS)2]\left[Pd\left(PPh_{3}\right)_{2}\left(NCS\right)_{2}\right] and [Pd(PPh3)2(SCN)2]\left[Pd\left(PPh_{3}\right)_{2}\left(SCN\right)_{2}\right]

Explanation

Solution

NCS−NCS^- is ambidentate ligand and it can be linked through N (or) S