| (a) Give a chemical test to distinguish between saturated and unsaturated hydrocarbon. [5] |
| (b) Name the products formed when ethane burns in air. Write the balanced chemical equation for the reaction showing the types of energies liberated. |
| (c) Why is reaction between methane and chlorine in the presence of sunlight considered a substitution reaction? |
Answer:
(a) Pass the vapours of the given samples of saturated and unsaturated hydrocarbons into bromine water in unsaturated hydrocarbons colour changes while in saturated it does not. (b) On burning ethane in air, the products obtained are \[C{{O}_{2}}\] and \[{{H}_{2}}O\] with heat and light. \[2{{C}_{2}}{{H}_{6}}\left( g \right)+7{{O}_{2}}\left( g \right)\to 4C{{O}_{2}}\left( g \right)+6{{H}_{2}}O\left( I \right)+Heat +Light\] (c) It is a substitution reaction as chlorine atom displaces hydrogen atoms of methane.
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