Question

Considering crystal field theory, strong field ligands such as CN
A) likely to produce High-Spin complexes and small crystal field splitting
B) likely to produce Low-Spin complexes and small crystal field splitting
C) likely produce Low-Spin complexes and high crystal field splitting.
D) likely produce High-Spin complexes and high crystal field splitting
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Answer 1

c will be the correct answer

CN being strong responsible for pairing and form a low spin complex which produces high crystal field splitting

Answer 2

Option C) likely produce Low-Spin complexes and high crystal field splitting.

Strong-field ligands like CN are likely to result in Low-Spin complexes and High Crystal Field Splitting according to Crystal Field Theory.

Theory of crystal fields:

• An electrostatic model called the crystal field theory (CFT) assumes that the metal-ligand connection is ionic and results only from electrostatic interactions between the metal ion and the ligand.
• When dealing with anions, ligands are viewed as point charges, and when dealing with neutral molecules, as dipoles.
• The breaking of orbital degeneracy in transition metal complexes caused by the presence of ligands is described by crystal field theory (CFT).
• The quality of the metal-ligand bonds is described by CFT.
• The energy of the system changes depending on how strong the bonds between the metal and ligand are.
• Both the magnetic and visual properties may alter as a result.

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