Question

Which of the following compounds is not a linkage isomer?

(a) Hg[Co(SCN)4]

(b) [Cr(H2O)5(NO2)]Cl2

(c) [CoCl2(en)2]Cl

(d) K[Cr(NH3)2(ONO)4]

I got this question in an interview.

The origin of the question is Isomerism in Coordination Compounds in chapter Coordination Compounds of Chemistry – Class 12

Answer 1

The correct option is (c) [CoCl2(en)2]Cl

The explanation: The compounds Hg[Co(SCN)4], [Cr(H2O)5(NO2)]Cl2 and K[Cr(NH3)2(ONO)4] have ambidentate ligands thiocyanate or nitrate in them and these ligands can bind through different donor atoms to produce different structures or isomers.