Question

What is spectrochemical series? Explain the difference between a weak field ligand and a strong field ligand

Answer 1

Spectrochemical series gives the arrangement of ligands in the increasing order of crystal field splitting.
Weak field ligands cause less crystal field splitting. They form high spin complexes. Examples include chloride ions, fluoride ions etc.
Strong field ligands cause greater crystal field splitting. They form low spin complexes. Examples includes cyanide ion and CO.