Among the following options, select the option in which each complex in Set-I shows geometrical isomerism and the two complexes in Set-II are ionization isomers of each other. [en = H2NCH2CH2NH2]
- Set-I: [Ni(CO)4] and [PdCl2(PPh3)2] Set-II: [Co(NH3)5Cl]SO4 and [Co(NH3)5(SO4)]Cl
- Set-I: [Co(en)(NH3)2Cl2] and [PdCl2(PPh3)2] Set-II: [Co(NH3)6][Cr(CN)6] and [Cr(NH3)6][Co(CN)6]
- Set-I: [Co(NH3)3(NO2)3] and [Co(en)2Cl2] Set-II: [Co(NH3)5Cl]SO4 and [Co(NH3)5(SO4)]Cl
- Set-I: [Cr(NH3)5Cl]Cl2 and [Co(en)(NH3)2Cl2] Set-II: [Cr(H2O)6]Cl3 and [Cr(H2O)5Cl]Cl2 H2O
Answer
(3) Set-I: [Co(NH3)3(NO2)3] and [Co(en)2Cl2] Set-II: [Co(NH3)5Cl]SO4 and [Co(NH3)5(SO4)]Cl
Solution
Geometrical isomerism: [MA3B3] (fac/mer), [M(AA)2B2] (cis/trans), square planar [MA2B2] (cis/trans); tetrahedral [MA4] and [MA5B] show none.
Ionization isomers exchange a ligand with the counter-ion: [Co(NH3)5Cl]SO4 / [Co(NH3)5(SO4)]Cl.
(A): [Ni(CO)4] is tetrahedral – no G.I.
(B): Set-II pair are coordination isomers. (D): [Cr(NH3)5Cl]Cl2 shows no G.I.; Set-II pair are hydrate isomers.
(C): [Co(NH3)3(NO2)3] (fac/mer) and [Co(en)2Cl2] (cis/trans) both show G.I.; Set-II are ionization isomers.
Answer: (C)