The compounds [PtCl2(NH3)4]Br2 [\text{PtCl}_2(\text{NH}_3)_4]\text{Br}_2 [PtCl2(NH3)4]Br2 and [PtBr2(NH3)4]Cl2 [\text{PtBr}_2(\text{NH}_3)_4]\text{Cl}_2 [PtBr2(NH3)4]Cl2 constitute a pair of:
Coordination compounds exhibit different types of isomerism. Some complexes are given in Column I, and the type of isomerism is given in Column II.
Column IColumn II(a)[Pt(NH3)2Cl2](i)Ionisation isomerism(b)[Co(en)3]3+(ii)Linkage isomerism(c)[Cr(NH3)5(SO4)]Br(iii)Optical isomerism(d)[Co(NH3)5(NO2)]Cl2(iv)Geometrical isomerism \begin{array}{|l|l|} \hline \textbf{Column I} & \textbf{Column II} \\ \hline (a) [\text{Pt(NH}_3)_2\text{Cl}_2] & (i) \text{Ionisation isomerism} \\ \hline (b) [\text{Co(en)}_3]^{3+} & (ii) \text{Linkage isomerism} \\ \hline (c) [\text{Cr(NH}_3)_5(\text{SO}_4)]\text{Br} & (iii) \text{Optical isomerism} \\ \hline (d) [\text{Co(NH}_3)_5(\text{NO}_2)]\text{Cl}_2 & (iv) \text{Geometrical isomerism} \\ \hline \end{array} Column I(a)[Pt(NH3)2Cl2](b)[Co(en)3]3+(c)[Cr(NH3)5(SO4)]Br(d)[Co(NH3)5(NO2)]Cl2Column II(i)Ionisation isomerism(ii)Linkage isomerism(iii)Optical isomerism(iv)Geometrical isomerism
The total number of chiral compound/s from the following is ________