Assertion : Boiling point of ethanol is higher than that of propane.
Reason : Molecular mass of ethanol is higher than propane.

Options

A. if both assertioon and reason are true and reason is the corrct explanation of assertion.
B. If both assertion and reason are ture but reason is not the corrcet 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, we will analyze the assertion and reason provided, and determine their validity.

### Step 1: Analyze the Assertion
**Assertion:** The boiling point of ethanol is higher than that of propane.

- Ethanol (C2H5OH) has a boiling point of approximately 78.37 °C.
- Propane (C3H8) has a boiling point of approximately -42.1 °C.

**Conclusion:** The assertion is true because the boiling point of ethanol is indeed higher than that of propane.

### Step 2: Analyze the Reason
**Reason:** The molecular mass of ethanol is higher than that of propane.

- Calculate the molecular mass of ethanol:
- Ethanol (C2H5OH):
- Carbon (C): 2 × 12 = 24
- Hydrogen (H): 6 × 1 = 6
- Oxygen (O): 1 × 16 = 16
- Total = 24 + 6 + 16 = 46 g/mol

- Calculate the molecular mass of propane:
- Propane (C3H8):
- Carbon (C): 3 × 12 = 36
- Hydrogen (H): 8 × 1 = 8
- Total = 36 + 8 = 44 g/mol

**Conclusion:** The reason is also true because the molecular mass of ethanol (46 g/mol) is indeed higher than that of propane (44 g/mol).

### Step 3: Evaluate the Explanation
While both the assertion and reason are true, the reason does not correctly explain why the boiling point of ethanol is higher than that of propane. The higher boiling point of ethanol is primarily due to the presence of hydrogen bonding, which is not addressed in the reason provided.

### Final Conclusion
- **Assertion:** True
- **Reason:** True, but it does not correctly explain the assertion.

Thus, the correct answer is that both the assertion and reason are true, but the reason is not the correct explanation for the assertion.

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