Compounds showing hydrogen bonding among $HF, NH_3, H_2S$ and $PH_3$ are

The boiling point of $p$-nitrophenol is higher than that of $o$-nitrophenol because:

Number of molecules from the following which can exhibit hydrogen bonding is $..........$ (nearest integer).
$CH_3OH, H_2O, C_2H_6, C_6H_6, \text{o-nitrophenol}, HF, NH_3$

Bond energy of covalent $O-H$ bond in water is

Among the common mineral acids,$H_2SO_4$ is less volatile due to

Structures of molecules of two compounds are given below:
$(a)$ Which of the two compounds will have intermolecular hydrogen bonding and which compound is expected to show intramolecular hydrogen bonding.
$(b)$ The melting point of a compound depends on,among other things,the extent of hydrogen bonding. On this basis,explain which of the above two compounds will show a higher melting point.
$(c)$ Solubility of compounds in water depends on the power to form hydrogen bonds with water. Which of the above compounds will form hydrogen bonds with water easily and be more soluble in it?