Which compound forms a linear polymer due to $H$-bonding?

Hydrogen bonding plays a central role in the following phenomena:
$(A)$ Ice floats in water.
$(B)$ Higher Lewis basicity of primary amines than tertiary amines in aqueous solutions.
$(C)$ Formic acid is more acidic than acetic acid.
$(D)$ Dimerisation of acetic acid in benzene.

Which among the following compounds does not show hydrogen bonding?

Hydrogen bond energy is equal to

In which of the following compounds is intramolecular hydrogen bonding present?

The correct order of volatility is: