Hydrolysis is the reverse process of

Options

A. decomposition
B. dehydration
C. neutralisation
D. dissociation.

Answer

To solve the question "Hydrolysis is the reverse process of," we need to understand the concept of hydrolysis and its relationship to other chemical processes.

### Step-by-Step Solution:

1. **Understanding Hydrolysis**:
- Hydrolysis is a chemical reaction that involves the addition of water to a substance. It typically breaks down compounds into smaller molecules.
- For example, when ethene (C₂H₄) reacts with water (H₂O), it forms ethanol (C₂H₅OH).

2. **Identifying the Reverse Process**:
- The reverse of hydrolysis would involve the removal of water from a compound. This is where dehydration comes into play.
- In the case of ethanol (C₂H₅OH), if we remove a water molecule (H₂O), we can revert back to ethene (C₂H₄).

3. **Comparing with Other Options**:
- **Decomposition**: This process involves breaking down a compound into simpler substances, but it does not specifically involve water.
- **Neutralization**: This is a reaction between an acid and a base to form water and a salt, which is not the reverse of hydrolysis.
- **Dissociation**: This refers to the separation of a compound into its ions in solution, which is also not the reverse of hydrolysis.

4. **Conclusion**:
- Since hydrolysis involves the addition of water, the reverse process, which involves the removal of water, is dehydration.
- Therefore, the correct answer is option 2: dehydration.

### Final Answer:
Hydrolysis is the reverse process of dehydration.