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Structure of Co(acac)3:

1. Six-membered ring
2. Five-membered ring
3. Four-membered ring
4. Three-membered ring

Correct answer: Five-membered ring

Solution

Co(acac)3 (tris-acetylacetonato cobalt(III)) forms a complex where each acetylacetonate ligand creates a five-membered chelate ring with the cobalt center.

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