Structures of molecules of two compounds are given:
(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 these two compounds will show higher melting point.
(c ) Solubility of compounds in water depends on power of formed hydrogen bonds with water. Which of these compounds will from hydrogen bond will water easily and be more soluble in it ?

Explanation

(a) Intramolecular hydrogen bonding is present in compound (I) and intermolecular hydrogen bonding in compound (II)

(b) Attractive forces in the molecules of compounds (II) are more because of extra hydrogen bonding as compared to compound (I) which exists as discrete molecules. Therefore, the melting point of compound (II) is higher than that of compound (I).
(c ) In compound (II), there is a scope of hydrogen bonding with `H_(2)O` molecules while there is no scope of any hydrogen bonding in (I) with `H_(2)O` molecules. As a result, compound (II) is more soluble in water as compared to compound (I)