Question

Why is co a stronger ligand than nh3 in complexes?

Answer 1

it depends on crystal field splitting energy

higher the crystal field splitting energy, stronger is the ligand

since CO has more crystal field splitting energy compared to NH3 it is more stronger ligand

Answer 2

by Shrapr9iy8aHABELLZ 21.12.2016. ... According to Ligand field theory;the π-acceptor ligands are the stronger ligand & the π-donating ligand is weak field ligand,Here we know that NH3 is aπ-donor in composition to the CO which is a π-acceptor ligand.