Respuesta :
Because ethylene glycol has two times as many hydroxyl groups (OH), there are more opportunities for an H-bond to form, raising the boiling point of ethylene glycol.
Ethylene glycol
Except for the carbon chain, ethylene glycol and propanol both contain hydroxyl groups (OH). Because there are two atoms present with a significant variation in electronegativity, both molecules are polar as a result (2.04 for H and 3.44 for O).
As a result, the electrons from the H atom close to the oxygen atom are forcefully drawn in that direction, creating a partial charge on H and a partial charge on the oxygen atom.
Both molecules are regarded as dipoles as a result of the distribution of such partial charges.
Because of the stark contrast in electronegativity between atoms like N, O, and F and H, the dipole-dipole interaction in these situations is explicitly referred to as a hydrogen bond.
In general, a substance's boiling point can be significantly increased by the H bond. In this instance, propanol only has one hydroxyl group while ethylene glycol has two.
Since there are twice as many hydroxyl groups present, there are more opportunities for H bonds to form, ethylene glycol has a higher boiling point than propanol.
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