Assertion: A solution of phenol and aniline will show negative deviations from Raoult's law
Reason : In case of negative deviations from Raoult's law , A-B forces are stronger than A-A and B-B forces .

Options

A. If both assertion and reason are true and reason is the correct explanation of assertion
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false
D. If both assertion and reason are false

Answer

To solve the question regarding the assertion and reason related to the behavior of a solution of phenol and aniline in terms of Raoult's law, we can break it down step by step.

### Step-by-Step Solution:

1. **Understanding Raoult's Law**:
Raoult's law states that the vapor pressure of a solution is directly proportional to the mole fraction of the solvent in the solution. For ideal solutions, the intermolecular forces between the different components (A and B) are similar to those in the pure components.

**Hint**: Recall that Raoult's law applies to ideal solutions where A-A and B-B interactions are similar to A-B interactions.

2. **Identifying the Components**:
In this case, we have phenol (let's denote it as A) and aniline (denote it as B). When these two substances are mixed, they can interact with each other.

**Hint**: Identify the components involved in the solution and denote them for clarity.

3. **Intermolecular Forces**:
When phenol and aniline are mixed, they can form strong hydrogen bonds due to the presence of hydroxyl (-OH) groups in phenol and amino (-NH2) groups in aniline. The A-B interactions (phenol-aniline) are stronger than the A-A (phenol-phenol) and B-B (aniline-aniline) interactions.

**Hint**: Consider the types of intermolecular forces present in the components. Hydrogen bonding is a key factor here.

4. **Negative Deviation from Raoult's Law**:
Since the A-B interactions are stronger, the solution does not behave ideally. This leads to a negative deviation from Raoult's law, meaning the actual vapor pressure of the solution is less than what would be predicted by Raoult's law.

**Hint**: Remember that negative deviation indicates stronger interactions between different molecules compared to similar molecules.

5. **Conclusion**:
Both the assertion (that a solution of phenol and aniline will show negative deviations from Raoult's law) and the reason (that in negative deviations, A-B forces are stronger than A-A and B-B forces) are correct. The reason correctly explains the assertion.

**Hint**: Summarize your findings to determine the relationship between the assertion and reason.

### Final Answer:
Both the assertion and reason are correct, and the reason is the correct explanation of the assertion. Therefore, the correct option is that both the assertion and reason are true, and the reason is a correct explanation of the assertion.