You have samples of four compounds: dimethyl ether, methane, difluoromethane, and ethanol. You measure the boiling points of the compounds as -128 °C, -52 °C, -25 °C, and 78 °C, but then lose the labels for each sample. Make the following predictions Which boils at 75°C?
You have samples of four compounds: dimethyl ether, methane, difluoromethane, and ethanol. You measure the boiling points of the compounds as -128 °C, -52 °C, -25 °C, and 78 °C, but then lose the labels for each sample. Make the following predictions Which boils at 75°C?
Boiling point: The point at which liquid is converted into vapor is known as boiling point. Boiling points of compounds depends upon intermolecular forces. The influence of these forces depends on the functional group present. We can explain the effect of these forces on the boiling point of compounds with the help of some examples. The intermolecular forces go in the order ion > hydrogen bonding > Dipole-Dipole > Van der Waals dispersion force.
Generally alcohols having intermolecular hydrogen bonding so having more bonding, ethers having dipole-dipole interactions so less boiling point than alcohols, hydrocarbons having van der Wall forces so less boiling point than ethers.
Therefore, boiling point order of dimethyl ether, methane, difluoromethane, and ethanol as follows:
Ethanol (78°C) > dimethyl ether (-25° C) >difluoromethane (-52°C)> methane (-128°C).
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