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The anion of acetylacetone (acac) forms Co(acac)3 chelate with Co3+. The rings of the chelate are:

1. three membered
2. five membered
3. four membered
4. six membered

Correct answer: five membered

Solution

The acetylacetone (acac) ligand forms a bidentate chelate with Co3+, coordinating through two oxygen atoms. This results in the formation of two five-membered rings in the complex.

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