Solution

A hydrogen bond is the electrostatic attraction between polar groups that occurs when a hydrogen $$(H)$$ atom bound to a highly electronegative atom such as nitrogen $$(N)$$, oxygen $$(O)$$ or fluorine $$(F)$$ experiences attraction to some other nearby highly electronegative atom. These hydrogen-bond attractions can occur between molecules (intermolecular) or within different parts of a single molecule (intramolecular). The hydrogen bond (5 to 30 kJ/mole) is stronger than a van der Waals interaction, but weaker than covalent or ionic bonds.