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NEET CHEMISTRYCoordination CompoundsMedium

Question

The strong field nature of CN−CN^- as a ligand can be attributed to:

A

It is a pseudohalide.

B

It can accept electrons from metal species.

C

It forms high-spin complexes with metal species.

D

It possesses a negative charge.

Step-by-Step Solution

The strong field nature of the CN−CN^- ligand is due to its π\pi-acceptor behavior. In addition to donating a lone pair of electrons to form a σ\sigma-bond with the central metal atom/ion, it can also accept electron density from the filled dd-orbitals of the metal ion into its vacant antibonding π∗\pi^* orbitals through back-bonding. This synergic interaction increases the crystal field splitting energy (Δ0\Delta_0), making CN−CN^- a strong field ligand.

Exam Context & Concepts Covered

This question aligns with the NEET CHEMISTRY syllabus, specifically targeting concepts from Coordination Compounds. Mastering this topic is crucial for scoring well in the upcoming medical entrance examinations. Solving conceptually related problems will help you understand the nuances of these concepts and improve your problem-solving speed.

CHEMISTRYCoordination Compoundsstrongnatureligandattributed

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A.4
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