Question

Two tests to distinguish between saturated n unsaturated hydrocarbon

Answer 1

Answer:

(a) Bromine water test - For this, bromine is used in the form of bromine water. Bromine water has a red-brown color due to the presence of bromine in it. When bromine water is added to an unsaturated compound, the red-brown color of bromine water is discharged. So, if an organic compound decolorizes bromine water, then it will be an unsaturated hydrocarbon (containing a double bond or a triple bond), but saturated hydrocarbon (alkanes) do not decolorize bromine water.  

(b) When ethane burns in air (combustion), carbon dioxide and water vapors are formed along with heat and light. 2C2H6 (Ethane ) + 702 (air) 4 CO2 (carbon dioxide) + 6H20 (water) + 3120 KJ This reaction is an exothermic reaction due to the evolution of heat.