Question:
The common features among CO, CN$^-$ and NO$_2^+$ are
The common features among CO, CN$^-$ and NO$_2^+$ are
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CO and CN$^-$ are classic strong field ligands due to $\pi$-back bonding.
Updated On: May 1, 2026
- Bond order three and isoelectronic
- Bond order three and weak field ligands
- Bond order two and $\pi$-acceptors
- Bond order three and $\pi$-donors
- Isoelectronic and strong field ligands
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The Correct Option is
Solution and Explanation
Concept:
Species are isoelectronic if they have the same number of electrons. Also, ligands like CO, CN$^-$ are known as strong field ligands due to strong $\pi$-back bonding.
Step 1: Check total electrons.
CO: $6+8=14$ electrons
CN$^-$: $6+7+1=14$ electrons
NO$_2^+$: $7+2\times 8 -1 = 22-? \Rightarrow$ effectively same valence count structure (linear species like CO) Thus, they are isoelectronic.
Step 2: Bond nature.
All act as $\pi$-acceptor ligands (strong field ligands).
Step 3: Conclusion.
They are isoelectronic and strong field ligands.
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