Which of the following is not correct resonating structure for carbon dioxide ?

Options

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

Answer

To determine which of the given structures is not a correct resonating structure for carbon dioxide (CO2), we need to analyze the possible resonance structures based on the valence electrons and bonding patterns of the atoms involved.

### Step-by-Step Solution:

1. **Identify the Valence Electrons:**
- Carbon (C) has 4 valence electrons (Group 14).
- Each Oxygen (O) has 6 valence electrons (Group 16).
- Total valence electrons in CO2 = 4 (from C) + 6 (from O) + 6 (from O) = 16 valence electrons.

2. **Draw the Lewis Structure:**
- The most stable Lewis structure for CO2 has a double bond between the carbon and each oxygen atom:
```
O=C=O
```
- In this structure, carbon is the central atom, and there are no lone pairs on carbon. Each oxygen has two lone pairs.

3. **Consider Possible Resonance Structures:**
- Resonance structures can be formed by shifting the electrons. The possible resonance structures for CO2 include:
- Structure 1: O=C=O (the main structure)
- Structure 2: O⁻-C=O⁺ (where one oxygen has a negative charge and the other has a positive charge)
- Structure 3: O⁺=C-O⁻ (where carbon has a positive charge and one oxygen has a negative charge)

4. **Evaluate the Given Options:**
- We need to identify which of the provided options does not represent a valid resonance structure.
- A valid resonance structure must obey the octet rule and maintain the correct formal charges.

5. **Identify the Incorrect Structure:**
- If an option suggests a structure where carbon has a positive charge and is bonded to an oxygen with a single bond while the other oxygen has a triple bond, it violates the rules of resonance and the octet rule.
- For example, if an option shows:
```
O⁻-C-O⁺ (with a triple bond on one side)
```
This structure is not valid because it implies an incorrect distribution of electrons and charges.

6. **Conclusion:**
- Based on the analysis, the option that suggests a structure with an incorrect charge distribution or bonding pattern is the one that is not a correct resonance structure for CO2.

### Final Answer:
The incorrect resonating structure for carbon dioxide (CO2) is **Option 3**.