ssuming that molecular weights are comparable, which of the following compounds would you expect to be the highest boiling?Group of answer choicesKetoneAlkeneAldehydeAlcohol
Question
ssuming that molecular weights are comparable, which of the following compounds would you expect to be the highest boiling?Group of answer choicesKetoneAlkeneAldehydeAlcohol
Solution
The boiling point of a compound is largely determined by the strength of its intermolecular forces. The stronger the intermolecular forces, the higher the boiling point.
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Ketones and aldehydes have a carbonyl group (C=O), which is polar, leading to dipole-dipole interactions.
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Alkenes are nonpolar and only have weak van der Waals forces.
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Alcohols have an -OH group, which is not only polar (leading to dipole-dipole interactions) but can also form hydrogen bonds with other alcohol molecules.
Hydrogen bonding is a stronger intermolecular force than dipole-dipole and van der Waals forces. Therefore, among the given options, alcohol would have the highest boiling point.
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