When two ice balls are pressed against each other,they unite to form one ball. Which of the following forces are responsible for holding them together?

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.

The molecular interactions responsible for hydrogen bonding in $HF$ are:

Would you expect the hydrides of $N$,$O$ and $F$ to have lower boiling points than the hydrides of their subsequent group members? Give reasons.

Which of the following does not have $H$-bonding?

Ortho-nitrophenol is less soluble in water than $p-$ and $m-$nitrophenol because...