Which one in the following is not the resonance structure of `CO_(2)`

Options

A. O=C=O
B. `.^(-)O-C-=O^(+)`
C. `.^(+)O-=C-O^(-)`
D. `O-=C=O`

Explanation

To determine which structure is not a resonance structure of carbon dioxide (CO₂), we need to analyze the possible resonance structures of CO₂.

### Step-by-Step Solution:

1. **Understanding Resonance Structures**:
Resonance structures are different ways of drawing the same molecule that show the delocalization of electrons. For CO₂, we need to identify the valid resonance structures.

2. **Drawing the Valid Resonance Structures**:
- **Structure 1**: Oxygen double bond to carbon, and carbon double bond to another oxygen (O=C=O). This is a valid resonance structure.
- **Structure 2**: Carbon has a triple bond with one oxygen and a positive charge, while the other oxygen has a negative charge (O⁻≡C⁺=O). This is also a valid resonance structure.
- **Structure 3**: The reverse of Structure 2, where the carbon has a positive charge and one oxygen has a triple bond with carbon (O≡C⁻=O). This is another valid resonance structure.

3. **Identifying the Incorrect Structure**:
- **Structure 4**: Oxygen triple bond to carbon and double bond to another oxygen (O≡C=O). This is not a valid resonance structure for CO₂ because it does not accurately represent the distribution of electrons in the molecule.

4. **Conclusion**:
After analyzing the structures, we conclude that the structure that is not a resonance structure of CO₂ is the one with a triple bond between carbon and one oxygen, and a double bond to another oxygen (O≡C=O).

### Final Answer:
The structure that is not a resonance structure of CO₂ is the one with a triple bond between carbon and oxygen (O≡C=O).

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