Question

The position of ligands in the formula of a mononuclear coordination entity depends on which of the following ?

• A. The first letter in the name of the ligand
• B. Charge on the ligand
• C. Atomicity of the ligand
• D. Denticity of the ligand

Answer 1

The correct option is A The first letter in the name of the ligand

The listing of ligands in the formula of mononuclear coordinataion entities is according to alphabetical order without any consideration of charge and prefixes di, tri, etc. including abbrivated ligands, it does not depend on the atomicity, denticity or the charge of the ligand.
If there are several ligands of the same type, the prefixes like di, tri, tetra, penta, etc., are used to indicate the number of ligands of that type.
For example, $\left[Co\right(N{H}_3{)}_6]C{l}_3$ is named Hexaamminecobalt (III) chloride.
If the ligand is complex and is repeated two, three or four times, then the word bis, tris, tetrakis, etc., are used.
For example, $\left[Co\right(en{)}_3]C{l}_3$ is named Tris-(ethane–1,2–diamine)cobalt (III) chloride.