Question

The anion of acetylacetone (acac) forms Co(acac)₃ chelate
with Co³⁺. The rings of the chelate are [NEET Kar. 2013]
(a) three membered (b) five membered
(c) four membered (d) six membered

Answer 1

Answer:

The anion of acetylacetone (acac) forms Co(acac)₃ chelate

with Co³⁺. The rings of the chelate are [NEET Kar. 2013]

(a) three membered

(b) five membered

(c) four membered

(d) six membered

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Answer 2

Six membered chelation with Co³⁺ is seen.

Explanation:

• Cobalt is a d block element.

• It has varied number of oxidation states which has atomic number of 27.

• So 3 of its d orbitals are empty which can lead to space for electron donation by other chelating agents.

• In Co³⁺, 6 of its d orbitals are empty.

• So it can accept 6 electron pairs from Acetyl acetone.

• Acetyl acetone is a biarmed chelating agent with 2 sites for chelation.

• So 3 of the Acetyl acetone chelates with Co³⁺ to form the 6 membered chelation.

• The geometry is octahedral and the hybridization of Co³⁺ is sp3d2.

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