Q. 434.9( 8 Votes )

Unsaturated hydrocarbons contain multiple bonds between the two C atoms and show addition reactions. Give the test to distinguish ethane from ethene.

Answer :

To distinguish between saturated and unsaturated hydrocarbons, combustion test should be performed. A saturated hydrocarbon undergoes complete combustion and burns with blue flame. Also, it does not leave any residue behind after burning. On the contrary, a unsaturated hydrocarbon undergoes incomplete combustion and burns with yellow flame. Also, it leaves some residue behind after burning. Ethane is a saturated hydrocarbon. Thus, burns with a blue flame and does not leave residue behind. Ethene is an unsaturated hydrocarbon. Thus burns with a yellow flame and leaves some residue behind.

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