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**Optical isomers (enantiomers)** in coordination compounds:
AAre superimposable mirror images
BAre non-superimposable mirror images, rotating plane-polarised light in opposite directions
CDiffer in chemical formula
DAre only possible in square planar geometry
Answer & Solution
Correct answer: B. Are non-superimposable mirror images, rotating plane-polarised light in opposite directions
Enantiomers = non-superimposable mirror images (chirality). One rotates plane-polarised light clockwise (d/dextro, +), the other anticlockwise (l/laevo, −). [Co(en)₃]³⁺ is a classic chiral octahedral complex. Square-planar complexes generally do **not** show enantiomerism (they have a mirror plane).
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