Question

Why is Br a weaker field ligand than CO?

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Solution

LigandsLigands are electron donors to metal atoms.Strong field ligands and weak field ligands are the two kinds of ligands.Strong field ligands cause a large splitting, whereas weak field ligands produce a small splitting.$\mathbf{Br}$ is a weak field ligand than $\mathbf{CO}$Carbonyl ligands $\left(\mathrm{CO}\right)$ are composed of carbon and oxygen atoms, with the oxygen atom acting as a donor and forming pi-bonds.These pi-bonds are held loosely and are readily ready for donation.$\mathrm{CO}$ is a stronger field ligand than $\mathrm{Br}$ because of pi-bonds.Bromine $\left(\mathrm{Br}\right)$ is a negatively charged ligand that is found in the form of ${\mathrm{Br}}^{-}$.Bromine is a weak field ligand because of its electronegativity, which makes it difficult to donate electrons.

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