Which of the following is an example of hydrolysis reaction ?

Options

A. `NH_(4)CI=NH_(4)^(+)+CI^(-)`
B. `NH_(4)^(+)+H_(2)O=NH_(4)OH+H^(+)`
C. `Na^(+)+H_(2)O=NaOH+H^(+)`
D. `CH_(3)COOH+HOC_(2)=CH_(3)COOC_(2)H_(5)+H_(2)O`

Answer

To determine which of the given options is an example of a hydrolysis reaction, we need to understand the definition of hydrolysis and analyze the provided options accordingly.

### Step-by-Step Solution:

1. **Understand Hydrolysis**:
- Hydrolysis is a chemical reaction where a compound reacts with water, resulting in the formation of new products. The general form can be represented as:
\[ \text{Compound} + \text{H}_2\text{O} \rightarrow \text{Products} \]

2. **Analyze the Options**:
- We need to look at each option provided and see if it fits the definition of hydrolysis.

3. **Evaluate Each Option**:
- **Option 1**: Not a hydrolysis reaction (does not involve water).
- **Option 2**: \( \text{NH}_4^+ + \text{H}_2\text{O} \rightarrow \text{NH}_4\text{OH} + \text{H}^+ \)
- This reaction involves the ammonium ion reacting with water to form ammonium hydroxide and a hydrogen ion, which fits the hydrolysis definition.
- **Option 3**: \( \text{Na}^+ + \text{H}_2\text{O} \rightarrow \text{NaOH} + \text{H}^+ \)
- This reaction is not feasible because the reduction potential of \( \text{Na}^+ \) is less than that of \( \text{H}^+ \), making it unlikely for \( \text{Na}^+ \) to react with water in this manner.
- **Option 4**: Not a hydrolysis reaction (does not involve water).

4. **Conclusion**:
- After evaluating the options, **Option 2** is the only one that represents a hydrolysis reaction. Therefore, the answer is:
\[ \text{Option 2: } \text{NH}_4^+ + \text{H}_2\text{O} \rightarrow \text{NH}_4\text{OH} + \text{H}^+ \]