The boiling point of a compound is raised by

Define hydrogen bond. Is it weaker or stronger than the van der Waals forces?

Select the incorrect match.

Which of the following has the highest boiling point?

Given below are two statements: one is labelled as Assertion $A$ and the other is labelled as Reason $R$.
Assertion $A$: Dipole-dipole interactions are the only non-covalent interactions resulting in hydrogen bond formation.
Reason $R$: Fluorine is the most electronegative element and hydrogen bonds in $HF$ are symmetrical.

Explain the types of Hydrogen bond,provide examples,and discuss their effect on physical properties.