Solution:
Butanal has no intermolecular hydrogen bonding but butan-1-ol has intermolecular hydrogen bonding. This bonding in butan-1-ol makes it more stable at a higher temperature than butanal.
Why is there a large difference in the boiling points of butanal and butane-1-ol?
Why is there a large difference in the boiling points of butanal and butane-1-ol?