Q40 · CSIR-NET Chemistry, June 2013

Paper: CSIR-NET June 2013 · Subject: Inorganic Chemistry · Chapter: Coordination Chemistry · Topic: Molecular Orbital Ligand Field · Marks: 2 · Difficulty: Medium

Identify the order representing increasing $\pi$-acidity of the following ligands $\mathrm{C}_{2} \mathrm{F}_{4}, \mathrm{NEt}_{3}, \mathrm{CO}$ and $\mathrm{C}_{2} \mathrm{H}_{4}$
(a)$\mathrm{CO}<\mathrm{C}_{2} \mathrm{F}_{4}<\mathrm{C}_{2} \mathrm{H}_{4}<\mathrm{NEt}_{3}$
(b)$\mathrm{C}_{2} \mathrm{F}_{4}<\mathrm{C}_{2} \mathrm{H}_{4}<\mathrm{NEt}_{3}<\mathrm{CO}$
(c)$\mathrm{C}_{2} \mathrm{H}_{4}<\mathrm{NEt}_{3}<\mathrm{CO}<\mathrm{C}_{2} \mathrm{F}_{4}$
(d)$\mathrm{NEt}_{3}<\mathrm{C}_{2} \mathrm{H}_{4}<\mathrm{C}_{2} \mathrm{F}_{4}<\mathrm{CO}$
Answer
Answer: D ✓ checked by 4AB · confidence high
Explanation
π-Acidity: NEt₃ (none) < C₂H₄ < C₂F₄ (electron-poor alkene) < CO.

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