The melecule that has 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 among the given options, we will analyze the molecular geometry of each compound.

### Step-by-Step Solution:

1. **Identify the Options**:
- CO₂ (Carbon Dioxide)
- NO₂ (Nitrogen Dioxide)
- SO₂ (Sulfur Dioxide)
- SiO₂ (Silicon Dioxide)

2. **Analyze CO₂**:
- The structure of CO₂ consists of a carbon atom double bonded to two oxygen atoms (O=C=O).
- The hybridization of carbon in CO₂ is sp, which results in a linear geometry.
- **Conclusion**: CO₂ has a linear structure.

3. **Analyze NO₂**:
- The structure of NO₂ consists of a nitrogen atom double bonded to one oxygen atom and has a coordinate bond with another oxygen atom, along with one lone pair on nitrogen.
- This arrangement results in a bent molecular geometry due to the presence of the lone pair.
- **Conclusion**: NO₂ has a bent structure.

4. **Analyze SO₂**:
- The structure of SO₂ consists of a sulfur atom double bonded to one oxygen atom and single bonded to another oxygen atom, with one lone pair on sulfur.
- Similar to NO₂, the lone pair causes the molecule to adopt a bent shape.
- **Conclusion**: SO₂ has a bent structure.

5. **Analyze SiO₂**:
- The structure of SiO₂ can be represented as Si bonded to multiple oxygen atoms in a network structure (Si-O-Si-O...).
- Although it may resemble CO₂ in terms of individual Si=O bonds, the overall structure is not linear due to the three-dimensional network formed.
- **Conclusion**: SiO₂ does not have a linear structure.

6. **Final Conclusion**:
- Among the given options, only CO₂ exhibits a linear structure.

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

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