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Optical isomers of [Co(en)₃]³⁺ (en = ethylenediamine):
AJust one (achiral)
BPair of enantiomers (Δ and Λ) — chiral tris-chelate
CMany
DNo isomers
Answer & Solution
Correct answer: B. Pair of enantiomers (Δ and Λ) — chiral tris-chelate
[Co(en)₃]³⁺ is chiral (tris-bidentate octahedral with no mirror plane). Two enantiomers labeled Δ (right-handed propeller) and Λ (left-handed). Rotate plane-polarized light in opposite directions.
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