Answer :

i) When ethanol is heated with excess conc. H2SO4 at 443K, it undergoes intra molecular dehydration (i.e. removal of water within a molecule of ethanol) to give ethene.


The reaction is intra molecular dehydration reaction.


ii) The equation for the above reaction is:



iii) The product formed is ethane (alkene), an unsaturated hydrocarbon which contains a double bond.


When this is passed through bromine water, it decolourises the water. It means decolourisation occurs.


iv) When ethanol vapour is passed through bromine water, no changes occur because it is neither a saturated nor an unsaturated hydrocarbon.


Ethanol is a functional group, hence no changes occur.


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