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Which one of the following octahedral complexes will not show geometric isomerism? (A and B are monodentate ligands)

1. [MA4B2]
2. [MA2B4]
3. [MA3B3]
4. [MA4B2]

Correct answer: [MA4B2]

Solution

The complex [MA4B2] will not show geometric isomerism because the four A ligands are identical, and the two B ligands can only be arranged in one way (cis or trans), which are indistinguishable due to symmetry.

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