Which nitrogen oxide has no N-N bond?

Options

A. `N_2O_4`
B. `N_2O`
C. `N_2O_3`
D. `N_2O_5`

Answer

To determine which nitrogen oxide has no N-N bond, we will analyze the structures of the given nitrogen oxides: N2O4, N2O, N2O3, and N2O5.

### Step-by-Step Solution:

1. **Identify the Compounds**: The nitrogen oxides we need to analyze are:
- N2O4
- N2O
- N2O3
- N2O5

2. **Draw the Structure of N2O4**:
- N2O4 consists of two nitrogen atoms and four oxygen atoms.
- The structure can be represented as:
```
O=N-O-N=O
```
- In this structure, there is a N-N bond between the two nitrogen atoms.

3. **Draw the Structure of N2O**:
- N2O consists of two nitrogen atoms and one oxygen atom.
- The structure can be represented as:
```
N≡N-O
```
- Here, there is also a N-N bond present.

4. **Draw the Structure of N2O3**:
- N2O3 consists of two nitrogen atoms and three oxygen atoms.
- The structure can be represented as:
```
O=N-O-N=O
```
- In this structure, there is a N-N bond between the two nitrogen atoms.

5. **Draw the Structure of N2O5**:
- N2O5 consists of two nitrogen atoms and five oxygen atoms.
- The structure can be represented as:
```
O=N-O-N=O
```
- However, in this case, the nitrogen atoms are bonded to oxygen atoms and do not form a direct N-N bond.

6. **Conclusion**:
- Among the compounds analyzed, N2O5 is the only nitrogen oxide that does not have an N-N bond. Therefore, the answer to the question is **N2O5** (option 4).