Which among the following is mixed anhydride?

Options

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

Answer

To determine which among the given compounds is a mixed anhydride, we need to analyze each option based on the definition of a mixed anhydride. A mixed anhydride is a compound that, when reacted with water, produces a mixture of two different acidic anhydrides.

### Step-by-Step Solution:

1. **Understanding Mixed Anhydrides**:
- A mixed anhydride is defined as a compound that reacts with water to yield two different acidic products (acidic anhydrides).

2. **Analyzing N2O4**:
- When N2O4 is reacted with water, it forms:
- Nitric acid (HNO3)
- Nitrous acid (HNO2)
- Since it produces two different acids, N2O4 qualifies as a mixed anhydride.

3. **Analyzing N2O3**:
- When N2O3 is reacted with water, it forms:
- Nitrous acid (HNO2)
- Since it only produces one acid, N2O3 does not qualify as a mixed anhydride.

4. **Analyzing N2O5**:
- When N2O5 is reacted with water, it forms:
- Nitric acid (HNO3)
- Again, since it only produces one acid, N2O5 does not qualify as a mixed anhydride.

5. **Analyzing NO2**:
- When NO2 is reacted with water, it forms:
- Nitric acid (HNO3)
- Nitrous acid (HNO2)
- Since it produces two different acids, NO2 also qualifies as a mixed anhydride.

6. **Conclusion**:
- The compounds that qualify as mixed anhydrides from the options provided are N2O4 and NO2.

### Final Answer:
The mixed anhydrides among the given options are **N2O4** and **NO2**.