Identify pair of complexes that exhibits solvate isomerism.

1. A \(\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_6\right] \mathrm{Cl}_3\) and \(\left[\mathrm{Cr}\left(\mathrm{H}_2 \mathrm{O}\right)_5 \mathrm{Cl}\right] \mathrm{Cl}_2 \cdot \mathrm{H}_2 \mathrm{O}\)
2. B \(\left[\mathrm{CO}\left(\mathrm{NH}_3\right)_5 \mathrm{SO}_4\right] \mathrm{Br}\) and \(\left[\mathrm{CO}\left(\mathrm{NH}_3\right)_5 \mathrm{Br}\right] \mathrm{SO}_4\)
3. C \(\left[\mathrm{CO}\left(\mathrm{NH}_3\right)_6\right]\left[\mathrm{Cr}(\mathrm{CN})_6\right]\) and \(\left[\mathrm{Cr}\left(\mathrm{NH}_3\right)_6\right]\left[\mathrm{CO}(\mathrm{CN})_6\right]\)
4. D \(\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_5 \mathrm{SCN}\right]^{+}\)and \(\left[\mathrm{Fe}\left(\mathrm{H}_2 \mathrm{O}\right)_5 \mathrm{NCS}\right]^{+}\)