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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?

Answers (1)

(a) NO_{2} and OH 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.

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