The process of evaporation of a liquid is accompanied by:
increase in enthalpy
decrease in entropy
no change in free energy
increase in entropy.

Options

A. increase in enthalpy
B. decrease in entropy
C. no change in free energy
D. increase in entropy.

Explanation

To solve the question regarding the process of evaporation of a liquid, we need to analyze each option provided and determine which one accurately describes the changes that occur during evaporation.

### Step-by-Step Solution:

1. **Understanding Evaporation**:
- Evaporation is the process by which a liquid turns into vapor (gas) at a temperature below its boiling point. This process requires energy, which is absorbed as heat from the surroundings.

2. **Analyzing the First Option (Increase in Enthalpy)**:
- During evaporation, energy is absorbed from the surroundings to overcome the intermolecular forces holding the liquid molecules together. This energy absorption leads to an increase in enthalpy (ΔH > 0).
- **Conclusion**: This option is correct.

3. **Analyzing the Second Option (Decrease in Entropy)**:
- Entropy is a measure of disorder in a system. When a liquid evaporates, the molecules transition from a more ordered state (liquid) to a less ordered state (gas). This results in an increase in randomness and, therefore, an increase in entropy (ΔS > 0).
- **Conclusion**: This option is incorrect.

4. **Analyzing the Third Option (No Change in Free Energy)**:
- Free energy (Gibbs free energy, G) is a measure of the spontaneity of a process. For a process to be spontaneous, the change in free energy (ΔG) must be negative (ΔG < 0). During evaporation, there is a change in the state of the system, which implies that there will be a change in free energy.
- **Conclusion**: This option is incorrect.

5. **Analyzing the Fourth Option (Increase in Entropy)**:
- As previously discussed, when a liquid evaporates, the molecules become more disordered as they transition to the gaseous state. This leads to an increase in entropy.
- **Conclusion**: This option is correct.

### Final Answer:
The process of evaporation of a liquid is accompanied by:
- **Increase in Enthalpy** (Option 1)
- **Increase in Entropy** (Option 4)