Question

Given below are two statements: One is labelled as Assertion A and the other is labelled as Reason R.  
Assertion A: Butan -1- ol has higher boiling point than ethoxyethane.  
Reason R: Extensive hydrogen bonding leads to stronger association of molecules.  
In the light of the above statements, choose the correct answer from the options given below: 

• A. Both A and R are true and R is the correct explanation of A
• B. A is true but R is false
• C. Both A and R are true but R is not the correct explanation of A
• D. A is false but R is true

Answer 1

The Correct Option is A

The given question involves understanding the boiling point differences between butan-1-ol and ethoxyethane and the role of hydrogen bonding in these differences.

1. Understanding the Assertion (A):
   Assertion A states that butan-1-ol has a higher boiling point than ethoxyethane. This assertion is true. The boiling point of butan-1-ol is indeed higher than that of ethoxyethane due to the presence of hydrogen bonding in butan-1-ol.
2. Understanding the Reason (R):
   Reason R states that extensive hydrogen bonding leads to stronger association of molecules. This is also true. Molecules that can form hydrogen bonds tend to have higher boiling points because hydrogen bonds are strong intermolecular forces, which require more energy to break.
3. Analysis:
   In butan-1-ol, the hydroxyl group (\(-OH\)) allows for hydrogen bonding between molecules, leading to a significant increase in the boiling point compared to ethers, like ethoxyethane, which cannot engage in hydrogen bonding.
4. Conclusion:
   Both Assertion A and Reason R are true, and Reason R correctly explains why butan-1-ol has a higher boiling point than ethoxyethane. Hydrogen bonding is indeed the primary factor for the higher boiling point.

Thus, the correct answer is: Both A and R are true and R is the correct explanation of A.