Which of the following rules is not correct regarding IUPAC nomenclature of complex ions ?

Options

A. Cation is named first and then anion .
B. In coordination sphere , the ligands are named alphabetically .
C. Positively charged ligands have suffix 'ate' .
D. More than one ligand of a particular type are indicated by using di, tri , tetra , etc.

Explanation

To solve the question regarding the incorrect statement about IUPAC nomenclature of complex ions, we will analyze each option provided in the question.

### Step-by-Step Solution:

1. **Understanding the Naming Order**:
- The first statement mentions that the cation is named first and the anion is named later. This is a fundamental rule in IUPAC nomenclature for coordination compounds.
- **Conclusion**: This statement is correct.

2. **Alphabetical Order of Ligands**:
- The second statement claims that ligands within the coordination sphere are named alphabetically. This is true; when naming ligands, they are arranged in alphabetical order regardless of their prefixes (di-, tri-, etc.).
- **Conclusion**: This statement is correct.

3. **Suffix for Charged Ligands**:
- The third statement asserts that positive charge ligands have the suffix "ate". This statement is incorrect because only negatively charged ligands receive the suffix "ate". For example, the ligand "chloride" becomes "chloro" and does not change to "chlorate".
- **Conclusion**: This statement is incorrect.

4. **Indicating Multiple Ligands**:
- The fourth statement mentions that more than one ligand of a particular type is indicated by using prefixes such as di-, tri-, etc. This is indeed true; for instance, if there are two chlorides, it would be named "dichloro".
- **Conclusion**: This statement is correct.

### Final Answer:
The incorrect statement regarding IUPAC nomenclature of complex ions is: **"Positive charge ligands have suffix 8."**

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