The molecule that has linear structure is:

Options

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

Explanation

To determine which molecule has a linear structure, we can analyze the molecular geometry of the given options. Let's consider the following molecules: CO2, NO2, SO2, and SiO2.

### Step 1: Analyze CO2 (Carbon Dioxide)
- Carbon (C) has 4 valence electrons and forms two double bonds with two oxygen atoms.
- The molecular geometry of CO2 is linear because there are no lone pairs on the central carbon atom, and the bond angle is 180°.

**Hint:** Look for the number of lone pairs and bond pairs around the central atom to determine the shape.

### Step 2: Analyze NO2 (Nitrogen Dioxide)
- Nitrogen (N) has 5 valence electrons and forms two bonds with oxygen atoms, but it also has one lone pair.
- The presence of a lone pair causes the molecule to adopt a bent shape rather than linear.

**Hint:** Lone pairs can affect the geometry of a molecule, often resulting in a bent shape.

### Step 3: Analyze SO2 (Sulfur Dioxide)
- Sulfur (S) has 6 valence electrons and forms two bonds with oxygen atoms, with one lone pair remaining.
- Similar to NO2, the lone pair leads to a bent structure for SO2.

**Hint:** Again, check for lone pairs; they can change the expected geometry from linear to bent.

### Step 4: Analyze SiO2 (Silicon Dioxide)
- Silicon (Si) has 4 valence electrons and forms four bonds with oxygen atoms, resulting in a tetrahedral structure.
- SiO2 does not have a linear structure; instead, it forms a three-dimensional network.

**Hint:** Consider the number of bonds and lone pairs; tetrahedral structures arise when a central atom forms four bonds.

### Conclusion
Based on the analysis, the molecule that has a linear structure is **CO2 (Carbon Dioxide)**.

**Final Answer:** CO2