Assertion : A mixture of acetone and methanol can be separated by fractional distillation.
Reason : The difference between their boiling points is very less.

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.

Explanation

To solve the question regarding the assertion and reason provided, we can break it down into clear steps:

### Step 1: Understand the Assertion
The assertion states that a mixture of acetone and methanol can be separated by fractional distillation.

**Hint:** Consider the properties of fractional distillation and when it is applicable.

### Step 2: Understand the Reason
The reason given is that the difference between the boiling points of acetone and methanol is very less.

**Hint:** Recall the boiling points of both substances to evaluate the difference.

### Step 3: Identify the Boiling Points
- The boiling point of acetone is approximately 56°C.
- The boiling point of methanol is approximately 64.7°C.

**Hint:** Calculate the difference between these two boiling points.

### Step 4: Calculate the Difference
The difference in boiling points is:
\[ 64.7°C - 56°C = 8.7°C \]

**Hint:** Compare this difference to the threshold for using fractional distillation.

### Step 5: Evaluate the Criteria for Fractional Distillation
Fractional distillation is typically used when the boiling point difference between the components is less than 25°C. Since 8.7°C is less than 25°C, fractional distillation can be applied.

**Hint:** Think about the implications of this criterion in practical applications.

### Step 6: Conclusion
Both the assertion and the reason are true. The assertion is correct because a mixture of acetone and methanol can indeed be separated by fractional distillation. The reason is also correct as the difference in their boiling points (8.7°C) is less than the 25°C threshold.

**Final Answer:** Both the assertion and reason are true, and the reason correctly explains the assertion.