question_answer 1)

  Viscosity of a liquid arises due to strong intermolecular forces existing between the molecules. Stronger the intermolecular forces, greater is the viscosity. Name the intermolecular forces existing in the following liquids and arrange them in the increasing order of their viscosities. Also give reason for the assigned order in one line. Water, hexane\[\left( C{{H}_{3}}C{{H}_{2}}C{{H}_{2}}C{{H}_{2}}C{{H}_{2}}C{{H}_{3}} \right)\], glycerine\[(C{{H}_{2}}OHCH(OH)\,C{{H}_{2}}OH)\]

Answer:

  Water and glycerine involve intermolecular hydrogen bondwhile hexane involves London-dispersion force. \[\xrightarrow[Increasing\text{ }intermolecular\text{ }force\text{ }and\text{ }increasing\text{ }viscosity]{Hexane\text{ }<\text{ }water\text{ }<\text{ }glycerol}\]