Question

Given below are two statements: Statement (I): The boiling points of alcohols and phenols increase with increase in the number of C-atoms.
Statement (II): The boiling points of alcohols and phenols are higher in comparison to other classes of compounds such as ethers and haloalkanes. In the light of the above statements, choose the correct answer from the options given below:

• A. Both Statement I and Statement II are false
• B. Statement I is false but Statement II is true
• C. Statement I is true but Statement II is false
• D. Both Statement I and Statement II are true

Hint:

The boiling points of compounds with hydrogen bonding, such as alcohols and phenols, are generally higher compared to compounds like ethers and haloalkanes, which lack hydrogen bonding.

Answer 1

The Correct Option is D

Statement (I): The boiling points of alcohols and phenols increase with an increase in the number of carbon atoms due to the increase in van der Waals forces (intermolecular forces) as the molecular size increases. This is a correct statement. - Statement (II): Alcohols and phenols have higher boiling points compared to ethers and haloalkanes due to the presence of hydrogen bonding between molecules, which requires more energy to break. This is also true. Therefore, both statements are true.