Which of the following compounds has the highest boiling point ?

A. Propan-1-ol
B. n-butane
C. Chloroethane
D. Propanal

The boiling point is the temperature at which the vapor pressure of a liquid equals the pressure surrounding the liquid and the liquid changes into a vapor. It depends upon factors, such as atmospheric pressure and intermolecular forces. If the intermolecular forces between the molecules of a compound are strong then the boiling point will increases.

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Now as we know that hydrogen bonds are strong intermolecular forces, so the boiling point will be high in that compound. When branching increases the boiling point decreases as it decreases the surface area thereby decreasing the forces.

Propan-1-ol undergoes intermolecular H-bonding because of the presence of the −OH group. So extra energy is required to break hydrogen bonds.

Hence Option A. Propan-1-ol is the correct answer.

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