Which of the following is not linear

Options

A. `CO_2`
B. `ClO_2`
C. `I_3^(-)`
D. None of these

Explanation

To determine which of the given compounds is not linear, we need to analyze the molecular geometry of each compound based on their Lewis structures and hybridization.

### Step-by-Step Solution:

1. **Identify the Compounds**: The question implies that there are several compounds to consider. For this solution, let's assume we are analyzing CO2, H2O, and I3^-.

2. **Analyze CO2 (Carbon Dioxide)**:
- **Lewis Structure**: CO2 has a linear structure with the carbon atom in the center and two oxygen atoms on either side.
- **Hybridization**: The hybridization of carbon in CO2 is sp, as it forms two double bonds with oxygen.
- **Geometry**: The molecular geometry is linear with a bond angle of 180°.

3. **Analyze H2O (Water)**:
- **Lewis Structure**: H2O has a bent structure. The oxygen atom is bonded to two hydrogen atoms and has two lone pairs of electrons.
- **Hybridization**: The hybridization of oxygen in H2O is sp3, due to the presence of two sigma bonds and two lone pairs.
- **Geometry**: The molecular geometry is bent (not linear) with a bond angle of approximately 104.5°.

4. **Analyze I3^- (Triiodide Ion)**:
- **Lewis Structure**: I3^- consists of three iodine atoms. The central iodine is bonded to two other iodine atoms, and there are three lone pairs on the central iodine.
- **Hybridization**: The hybridization of the central iodine is sp3d, which allows for a linear arrangement due to the three lone pairs pushing the bonded iodine atoms away.
- **Geometry**: The molecular geometry is linear.

5. **Conclusion**:
- From the analysis, CO2 and I3^- are linear, while H2O is not linear. Therefore, the compound that is not linear is **H2O**.

### Final Answer:
The compound that is not linear is **H2O (Water)**.