Why is there a large difference in the boiling points of butanal and butan$-1-$ol?

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The boiling point of butan$-1-$ol is significantly higher than that of butanal because butan$-1-$ol molecules are associated through intermolecular hydrogen bonding.
In contrast,butanal molecules are held together only by weak dipole-dipole interactions.
This strong intermolecular hydrogen bonding in alcohols requires more energy to break,resulting in a higher boiling point compared to aldehydes of similar molecular mass.

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