(P) [Cr(NH3)4Cl2]Cl→ Paramagnetic and exhibits cis-trans isomerism
(Q) [Ti(H2O)5Cl](NO3)2→ Paramagnetic and exhibits ionization isomerism
(R) [Pt(en)(NH3)Cl]NO3→ Diamagnetic and exhibits ionization isomerism
(S) [Co(NH3)4(NO3)2]NO3→ Diamagnetic and exhibits cis-trans isomerism