Question:
Identify a ligand having two donor atoms and uses pairs of electrons on both donor atoms.
Identify a ligand having two donor atoms and uses pairs of electrons on both donor atoms.
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“en” ligand = 2 N donors → classic bidentate ligand.
Updated On: May 4, 2026
- Nitro
- Isothiocyanato
- Ethylenediamine
- Carbonyl
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The Correct Option is C
Solution and Explanation
Concept:
Ligands are classified based on number of donor atoms:
• Monodentate → One donor atom
• Bidentate → Two donor atoms
• Polydentate → More than two donor atoms
Step 1: Identify bidentate ligand. Ethylenediamine (en):
• Has two nitrogen atoms
• Each donates a lone pair Thus, it is a bidentate ligand.
Step 2: Analyze options.
• (A) Nitro → Monodentate $\times$
• (B) Isothiocyanato → Ambidentate but not bidentate $\times$
• (C) Ethylenediamine → Two donor atoms \checkmark
• (D) Carbonyl → Monodentate $\times$
Step 3: Conclusion. \[ \text{Ethylenediamine is a bidentate ligand} \]
Ligands are classified based on number of donor atoms:
• Monodentate → One donor atom
• Bidentate → Two donor atoms
• Polydentate → More than two donor atoms
Step 1: Identify bidentate ligand. Ethylenediamine (en):
• Has two nitrogen atoms
• Each donates a lone pair Thus, it is a bidentate ligand.
Step 2: Analyze options.
• (A) Nitro → Monodentate $\times$
• (B) Isothiocyanato → Ambidentate but not bidentate $\times$
• (C) Ethylenediamine → Two donor atoms \checkmark
• (D) Carbonyl → Monodentate $\times$
Step 3: Conclusion. \[ \text{Ethylenediamine is a bidentate ligand} \]
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