Between a water molecule and an ethanol molecule, a hydrogen bond can occur between a lone pair of electrons on the Oxygen and a Hydrogen in water and the Polar hydrogen of an ethanol molecule.
What is Hydrogen bond ?
Hydrogen bonding is an interaction involving a hydrogen atom located between a pair of other atoms having a high affinity for electrons.
It is a bond is weaker than an ionic bond or covalent bond but stronger than van der Waals forces.
In the given question, They will form a hydrogen bond with the oxygen atom and the polar hydrogen atom.
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