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) The solubility of compounds in water depends on the power to form hydrogen bonds with water. Which of the above compounds will form a hydrogen bond with water easily and be more soluble in it?
(a) and groups are close together compared to the other compound; therefore, compound (I) will form an intramolecular hydrogen bonding, whereas compound (II) will show intermolecular bonding.
(b) Compound (II) forms intermolecular H-bonds, joining, more and more molecules are joined together through H-bonds; hence it will have a higher melting point.
(c) Compound (I) will not be able to form hydrogen bonds with water due to intramolecular H-bonding, thus, will be less soluble in it while compound (II) will be able to form H-bond with water more easily and will be soluble in water.