For polar molecules, when does hydrogen bonding occur?
Well, for a start, the polar molecule BY SPECIFICATION, must contain hydrogen atoms bound to a electronegative element......to engage in hydrogen bonding.....
And three molecules may be used as exemplars:
For each molecule we could represent the dipoles, the charge separation this way:
If you interrogate the boiling points of these molecules (and you should, because as a physical scientist always must consider the actual data), certainly you will find the boiling points anomalously high. Certainly they are high compared to homologous,