Question

Identify the compound having highest boiling point from the following.

• A. Propanal
• B. Methoxy ethane
• C. Propane
• D. Propan-1-ol

Hint:

Alcohols typically have higher boiling points than aldehydes, ethers, and alkanes due to hydrogen bonding.

Answer 1

The Correct Option is D

Step 1: Boiling points and intermolecular forces.
Boiling point is determined by the strength of intermolecular forces. Alcohols like propan-1-ol have hydrogen bonding, which results in a higher boiling point compared to aldehydes (propanal), ethers (methoxy ethane), and alkanes (propane), which have weaker intermolecular forces.
Step 2: Analyzing the options.
(A) Propanal: Propanal is an aldehyde and has weaker intermolecular forces compared to alcohols, so it has a lower boiling point than propan-1-ol.
(B) Methoxy ethane: This is an ether, which has weaker dipole-dipole interactions compared to alcohols.
(C) Propane: Propane is an alkane and has the weakest intermolecular forces (London dispersion forces), so it has the lowest boiling point.
(D) Propan-1-ol: This is an alcohol and has the highest boiling point due to hydrogen bonding.
Step 3: Conclusion.
The correct answer is (D) Propan-1-ol.