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Coordination Compounds
Geometrical Isomerism
1 question from 1 paper, each with its answer.
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Concepts tested
- Geometrical isomerism in octahedral complexes
All Questions
2003 AIPMT 1 question
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Which one of the following octahedral complexes will not show geometric isomerism ? (A and B are monodentate ligands)$[MA_4B_2]$ and $[MA_2B_4]$: the two identical minority ligands can be adjacent (cis) or opposite (trans), so they show cis–trans isomerism.
$[MA_3B_3]$: the three A ligands can lie on one face of the octahedron (facial, fac) or along a meridian (mer), so it shows fac–mer isomerism.
$[MA_5B]$: there is only one B ligand. Whichever of the six positions it occupies, all arrangements are identical, so there is only one form.
So $[MA_5B]$ will not show geometric isomerism.