Rank the following compounds according to their boiling point. Highest Boiling Point 
acetic acid 
acetaldehyde 
ethanol 
ethane 
Lowest Boiling Point 
Highest Boiling Point Lowest Boiling Point

Highest boiling point: acetic acid

ethanol

acetaldehyde

Lowest boiling point: ethane

Explanation: carboxylic acids have highest boiling point due to hydrogen bonding than ethanols. The hydrogen bonding in carboxylic acids is stronger than alcohols. alkanes have lowest boiling point due to weak intramolecular forces of interactions.