In which of the following N-N bond is not present ?

Options

A. `N_(2) O_(5)`
B. `N_(2) O`
C. `N_(2) O_(4)`
D. `N_(2) O_(3)`

Answer

To determine in which of the following compounds an N-N bond is not present, we will analyze each option step by step.

### Step 1: Analyze the first compound - N2O5
- **Compound Name**: Dinitrogen pentoxide (N2O5)
- **Structure**:
- The structure of N2O5 can be represented as:
```
O
||
N-O-N
|
O
```
- In this structure, there are no N-N bonds present. The nitrogen atoms are bonded to oxygen atoms instead.

### Conclusion for N2O5:
- **N-N bond is not present**.

### Step 2: Analyze the second compound - N2O
- **Compound Name**: Dinitrogen monoxide (N2O)
- **Structure**:
- The structure of N2O can be represented as:
```
N≡N
|
O
```
- Here, there is a triple bond between the two nitrogen atoms (N≡N), indicating that an N-N bond is present.

### Conclusion for N2O:
- **N-N bond is present**.

### Step 3: Analyze the third compound - N2O4
- **Compound Name**: Dinitrogen tetraoxide (N2O4)
- **Structure**:
- The structure of N2O4 can be represented as:
```
O
||
N-O-N
||
O
```
- In this structure, there is also an N-N bond present, as the two nitrogen atoms are connected.

### Conclusion for N2O4:
- **N-N bond is present**.

### Step 4: Analyze the fourth compound - N2O3
- **Compound Name**: Dinitrogen trioxide (N2O3)
- **Structure**:
- The structure of N2O3 can be represented as:
```
O
||
N-N
|
O
```
- Here, there is an N-N bond present between the two nitrogen atoms.

### Conclusion for N2O3:
- **N-N bond is present**.

### Final Answer:
The compound in which an N-N bond is not present is **N2O5**.

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