Answer:
Ethanol has the highest boiling point = 78.5°C,
propane has the lowest boiling point = −42.1°C
and the boiling point of dimethyl ether = −23°C
Explanation:
The boiling point of a given substance is the temperature at which a given substance present in the liquid state changes to the vapor state.
The boiling point of the substance depends on the intermolecular forces.
<u>As the strength of the intermolecular forces increases, the boiling point also increases.</u>
<u>The relative strength:</u> Ionic bonds > Hydrogen bonding > dipole-dipole interactions > Van der Waals dispersion forces.
The intermolecular forces present in the following compounds are:
Propane (CH₃CH₂CH₃)- <u>weak van der Waals dispersion forces</u>
Dimethyl ether (CH₃OCH₃)- <u>weak dipole-dipole interactions</u>
Ethanol (CH₃CH₂OH)- <u>strong hydrogen bonding</u>
Therefore, Ethanol has the highest boiling point = 78.5°C, propane has the lowest boiling point = −42.1°C and the boiling point of dimethyl ether = −23°C