Which of the following is not an interhalogen compound ?

Options

A. `I Cl_(4)^(-)`
B. `ClF_(5)`
C. `IPO_(4)`
D. `ClF_(3)`

Explanation

To determine which of the given compounds is not an interhalogen compound, we need to understand what interhalogen compounds are.

### Step-by-Step Solution:

1. **Definition of Interhalogen Compounds**:
Interhalogen compounds are molecules that consist of two or more different halogen atoms. The halogens include fluorine (F), chlorine (Cl), bromine (Br), iodine (I), and astatine (At). Importantly, interhalogen compounds do not contain any atoms from elements outside the halogen group.

2. **Analyzing the Options**:
We need to evaluate each option provided to identify whether it meets the criteria of being an interhalogen compound.

- **Option 1**: ICl (Iodine Chloride)
- Contains iodine (I) and chlorine (Cl), both of which are halogens.
- Therefore, ICl is an interhalogen compound.

- **Option 2**: Cl2 (Chlorine)
- Contains two chlorine (Cl) atoms. While it consists of halogens, it does not contain two different halogens.
- Therefore, Cl2 is not considered an interhalogen compound.

- **Option 3**: IPO4 (Phosphorus Oxyanion)
- Contains phosphorus (P) and oxygen (O), which are not halogens.
- Therefore, IPO4 is not an interhalogen compound.

- **Option 4**: ClF (Chlorine Fluoride)
- Contains chlorine (Cl) and fluorine (F), both of which are halogens.
- Therefore, ClF is an interhalogen compound.

3. **Conclusion**:
Based on the analysis, the compound that is not an interhalogen compound is IPO4 (Option 3).

### Final Answer:
The compound that is not an interhalogen compound is **IPO4**.

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