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Which of the following coordination compounds can exhibit optical isomerism, geometrical isomerism, and linkage isomerism simultaneously?
- [Co(ox)3]³-
- [Cr(ox)2(NO2)2]³-
- [Fe(H2O)5(NO2)]⁺
- [Ni(gly)2]
Correct answer: [Cr(ox)2(NO2)2]³-
Solution
[Cr(ox)2(NO2)2]³-: oxalate (ox²-) is bidentate but not ambidentate; NO2- is ambidentate (linkage isomerism: N-bonded nitro or O-bonded nitrito). The complex is octahedral with two bidentate ox and two NO2, giving cis/trans geometric isomers. The cis isomer is chiral (non-superimposable on its mirror image), giving optical isomers. So all three types of isomerism are present. The other complexes lack linkage isomerism (no ambidentate ligand) or lack geometric/optical isomerism.
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