A solution that shows negative deviation from Raoult’s Law among the following is:

Options

A. ethanol-acetone
B. chlorobenzene-bromobenzene
C. chloroform-acetone
D. benzene-toluene

Answer

To determine which solution shows a negative deviation from Raoult's Law, we need to understand what negative deviation means and how it relates to the interactions between the components of a solution.

### Step-by-Step Solution:

1. **Understanding Raoult's Law**:
Raoult's Law states that the vapor pressure of a solvent in a solution is directly proportional to the mole fraction of the solvent in the solution. For ideal solutions, the interactions between different molecules are similar to the interactions between like molecules.

2. **Identifying Deviations**:
- **Negative Deviation**: This occurs when the vapor pressure of the solution is lower than expected. This typically happens when the interactions between different components are stronger than the interactions between like components.
- **Positive Deviation**: This occurs when the vapor pressure of the solution is higher than expected, indicating weaker interactions between different components compared to like components.

3. **Analyzing the Given Options**:
We need to identify which of the given solutions shows negative deviation. The video mentions acetone and chloroform as an example of a solution that shows negative deviation.

4. **Reason for Negative Deviation**:
Acetone (CH₃C(O)CH₃) and chloroform (CHCl₃) form strong hydrogen bonds when mixed. This strong interaction leads to a lower vapor pressure than expected, which is characteristic of negative deviation from Raoult's Law.

5. **Conclusion**:
Based on the information provided, the correct answer to the question is that the solution showing negative deviation from Raoult's Law is the one containing acetone and chloroform.

### Final Answer:
The solution that shows negative deviation from Raoult’s Law is acetone and chloroform.

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