[tex]N_{2} H_{4}[/tex], [tex]H_{3}CO_{2}H[/tex] and [tex]C_{2}H_{2}O_{4}[/tex] are the molecules that can exhibit hydrogen bonding as a pure liquid.
The significant difference in electronegativity between the H atom and the N, O, or F atom creates a highly polar covalent bond in molecules with N-H, O-H, or F-H bonds (i.e., a bond dipole).
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