(i) Give a kherical test to distinguish between saturated and unsaturated hydrocarbons. (ii) Name the products fornted when ethanol burns in air. List two forms of energy that are liberated on burning ethanol. (iii) Why is the reaction between methane and chlorine considered a substitution reaction?

(i) Give a kherical test to distinguish between saturated and unsatura

1.	(i) Give a kherical test to distinguish between saturated and unsaturated hydrocarbons. (ii) Name the products fornted when ethanol burns in air. List two forms of energy that are liberated on burning ethanol. (iii) Why is the reaction between methane and chlorine considered a substitution reaction?
Answer» Solution :a)Add bromise water .Saturated hydrocarbons do not react whereas unsaturated hydrocarbon will decolourise bromise water. i) `CO_(2)` and `H_(2)O` are formed. `C_(2)H_(5)OH(l)+3O_(2)(g)to2CO_(2)(g)+3H_(2)O(l)+Heat+light` II)Heat energy and light energy. c)It is because Cl atom SUBSTITUTES .H. atom of methane to from chloromthane and hydrogen CHLORIDE. `underset("Metane")(CH_(4)(g)+)underset("Clorine")(Cl_(2)(g))overset(sunlight)tounderset("Chloromehane")(CH_(3)CL(g)+Hel(g))`