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Answer: 1. Geometrical isomerism

\([\mathrm{CoCl_2(en)_2}]\) is octahedral of type \([\mathrm{M(AA)_2X_2}]\). The two Cl can be adjacent (cis) or opposite (trans), so it shows geometrical isomerism; the cis form is also optically active.

No ionisable ligand exchanges with a counter ion, no second complex ion, and no ambidentate ligand is present, so ionisation, coordination and linkage isomerism are ruled out.

Doubtly AI · 30 Oct 2026 AI-generated · not yet verified Report
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