Which of the following statements about coordination chemistry is correct?

Chelation effect is maximum for five- and six-membered chelate rings
Greater the charge on the central metal cation, greater the value of Delta (crystal field splitting energy)
In the complex ion [CoF6]³-, F- is a weak-field ligand with Delta_oct < P (pairing energy), making it a low-spin complex
The complex ion [CoCl2(NH3)2(en)]⁺ has four distinct isomers

Correct answer: Chelation effect is maximum for five- and six-membered chelate rings

Solution

Five- and six-membered chelate rings provide maximum stability due to minimal ring strain, making option A correct. Option C is wrong because Delta_oct < P (weak field) gives a high-spin complex, not low-spin.

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