The molecule that has a linear structure is :

Options

A. `CO_(2)`
B. `NO_(2)`
C. `SO_(2)`
D. `SiO_(2)`

Answer

To determine which molecule has a linear structure, we will analyze the given options one by one.

### Step-by-Step Solution:

1. **Identify the Molecules**: The question asks for a molecule with a linear structure. The options provided are CO2, NO2, SO2, and SiO2.

2. **Analyze CO2 (Carbon Dioxide)**:
- CO2 consists of one carbon atom and two oxygen atoms.
- The carbon atom forms double bonds with each oxygen atom.
- The molecular geometry can be determined using VSEPR theory. Since there are no lone pairs on the central carbon atom and it has two double bonds, the shape is linear.
- The bond angle is 180 degrees.
- **Conclusion**: CO2 has a linear structure.

3. **Analyze NO2 (Nitrogen Dioxide)**:
- NO2 consists of one nitrogen atom and two oxygen atoms.
- The nitrogen atom forms one double bond with one oxygen and one single bond with the other oxygen.
- There is one lone electron on nitrogen, which causes repulsion and results in a bent or V-shaped structure.
- **Conclusion**: NO2 does not have a linear structure.

4. **Analyze SO2 (Sulfur Dioxide)**:
- SO2 consists of one sulfur atom and two oxygen atoms.
- Similar to NO2, sulfur forms one double bond with one oxygen and one single bond with the other oxygen.
- There is one lone pair on the sulfur atom, leading to a bent structure.
- **Conclusion**: SO2 does not have a linear structure.

5. **Analyze SiO2 (Silicon Dioxide)**:
- SiO2 consists of one silicon atom and two oxygen atoms.
- In the solid state, SiO2 forms a three-dimensional tetrahedral structure rather than a linear one.
- The basic unit is tetrahedral, and it does not exhibit linear geometry.
- **Conclusion**: SiO2 does not have a linear structure.

6. **Final Answer**: After analyzing all the options, the only molecule that has a linear structure is **CO2**.

### Summary:
- The molecule that has a linear structure is **CO2**.