How will you distinguish between Ethane and Ethene Chemically ? Give Reaction Involved.

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Solution

Ethane and ethene can be differentiated by the bromine test. The colour of bromine water is red-brown.
Unsaturated hydrocarbons decolourised the bromine water, whereas saturated hydrocarbon will not decolourise it.
Ethene is an unsaturated compound and ethane is a saturated compound. Ethene will react with bromine water and will decolourise bromine water but ethane will not. The reaction is :
$C H_{2} = C H_{2} + B r_{2} ⟶ C H_{2} B r - C H_{2} B r$
$C H_{3} - C H_{3} + B r_{2} ⟶ N o r e a c t i o n$

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