question_answer 40)

  Identify the unsaturated compounds from the following. (i) Propane                         (ii) Propene         (iii) Propyne                       (iv) Chloropropane (a) (i) and (ii)                      (b) (ii) and (iv)                   (c) (iii) and (iv)                   (d) (ii) and (iii)

Answer:

                  (d) A hydrocarbon in which the two carbon atoms are connected by a 'double bond' or a 'triple bond' is called an unsaturated hydrocarbon. (ii) Propene,  and (iii) propyne  both have double and triple bonds, respectively hence unsaturated. Propane and chloropropane are saturated hydrocarbons which contain only single bonds.