Question

Which of the following has highest boiling point?

• A. Ethanol
• B. Propane
• C. Pentanol
• D. All have same

Answer 1

The correct option is C

Pentanol

The decreasing order of boiling points is: Pentanol $>$ Ethanol $>$ Propane

Pentanol and ethanol have H-bonding, but molecular mass of pentanol is more than ethanol, so it has high boiling point. Propane has the least boiling point due to non-polar character and weak van der Waals forces of attraction.