11th Class Chemistry Chemical Bonding and Molecular Structure

  • question_answer 78)   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 higher melting point? (c) Solubility of compounds in water depends on power toform hydrogen bonds with water. Which of the abovecompounds will form hydrogen bond with water easilyand be more soluble in it?

    Answer:

      (a) Intramolecular hydrogen bonding is observed in compound \[(I)\] because \[N{{O}_{2}}\] and OH groups are nearer to each other. In compound \[(II)\] intermolecular hydrogen bonding is observed as different molecules are involved. (b) Compound \[(II)\] will have higher melting point as it is an associated species. (c) Compound \[(I)\] is less soluble than compound \[(II)\]. Compound \[(II)\] easily forms hydrogen bonds with water.


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