Ethanol has a higher boiling point than methoxymethane because ethanol contains an –OH group that forms intermolecular hydrogen bonding between its molecules.

In ethanol, the hydrogen atom of the –OH group forms a hydrogen bond with the oxygen atom of another ethanol molecule. This creates strong intermolecular forces that require more energy to break during boiling. Methoxymethane, being an ether, lacks the –OH group and therefore cannot form such intermolecular hydrogen bonding.

The large difference in boiling points between alcohols and ethers is primarily due to the presence of hydrogen bonding in alcohols, which is absent in ethers. This makes alcohols have significantly higher boiling points compared to ethers of comparable molecular masses.