Which of the following is not structure of nitromethane molecule?

Options

A.
B.
C.
D.

Answer

To determine which of the given structures is not a valid representation of the nitromethane molecule, we first need to understand the correct structure of nitromethane (CH3NO2).

### Step-by-Step Solution:

1. **Identify the Chemical Formula**:
- Nitromethane has the chemical formula CH3NO2. This means it consists of one carbon (C), three hydrogens (H), one nitrogen (N), and two oxygens (O).

2. **Draw the Basic Structure**:
- The carbon atom is the central atom bonded to three hydrogen atoms (forming a methyl group, CH3).
- The nitrogen atom is bonded to the carbon and has two oxygen atoms bonded to it.

3. **Determine the Bonding of Nitrogen**:
- The nitrogen atom in nitromethane typically forms one double bond with one oxygen atom and a single bond with the other oxygen atom.
- The double bond is represented as N=O, and the single bond can be represented as N-O.

4. **Account for Charges**:
- In the nitro group (NO2), one of the oxygen atoms carries a negative charge while the nitrogen carries a positive charge, resulting from the resonance structures.
- The resonance structures can show the distribution of electrons differently but maintain the overall connectivity.

5. **Evaluate Given Structures**:
- Now, compare the provided structures with the correct representation of nitromethane. Identify any structure that does not conform to the bonding patterns and charge distributions described.

6. **Identify the Incorrect Structure**:
- The structure that does not maintain the correct bonding (for example, having more than four bonds on nitrogen or incorrect charge distributions) is the one that is not a valid representation of nitromethane.

7. **Conclusion**:
- Based on the analysis, the structure identified as option D is not a valid structure of nitromethane because it violates the bonding rules (like having a hydrogen removed incorrectly or showing incorrect bonding).

### Final Answer:
- The structure that is not a valid representation of nitromethane is **option D**.