Among the following compounds, which one has maximum boiling point ?

Propionic acid

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Ethyl methyl ketone

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n-butyraldehyde

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n-pentane

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Solution

The correct option is A Propionic acid
Carboxylic acids have higher boiling points than aldehydes, ketones, and given alcohol of comparable molecular mass. This is because of formation of intermolecular H-bonding.

Propionic acid has maximum boiling point due to formation of intermolecular hydrogen bonds.

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