Which of the following pairs represents linkage isomers ?

$\left[\mathrm{Cu}\left(\mathrm{NH}_3\right)_4\right]\left[\mathrm{Pt} \mathrm{Cl}_4\right]$ and $\left[\mathrm{Pt}\left(\mathrm{NH}_3\right)_4\right]\left[\mathrm{CuCl}_4\right]$
$\left[\mathrm{Pd}\left(\mathrm{PPh}_3\right)_2(\mathrm{NCS})_2\right]$ and $\left[\mathrm{Pd}\left(\mathrm{PPh}_3\right)_2(\mathrm{SCN})_2\right]$
$\left[\mathrm{CO}\left(\mathrm{NH}_3\right)_5 \mathrm{NO}_3\right] \mathrm{SO}_4$ and $\left[\mathrm{CO}\left(\mathrm{NH}_3\right)_5 \mathrm{SO}_4\right] \mathrm{NO}_3$
$\left[\mathrm{PtCl}_2\left(\mathrm{NH}_3\right)_4\right] \mathrm{Br}$ and $\left[\mathrm{PtBr}_2\left(\mathrm{NH}_3\right)_4\right] \mathrm{Cl}_2$

Solution

NCS is ambidentate ligand and it can be linked through $N$ (or) S

Asked in: JEE Main 2009