Intramolecular hydrogen bonding is formed in

Which of the following hydrogen bonds is likely to be the weakest?

Which of the following molecules are expected to exhibit intermolecular $H$-bonding?
$(I)$ Acetic acid $(II)$ $o$-nitrophenol $(III)$ $m$-nitrophenol $(IV)$ $o$-boric acid
Select the correct alternative.

Contrary to other hydrogen halides,hydrogen fluoride is a liquid because

Which of the following molecules does not develop intermolecular hydrogen bonding?

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.