Which of the following is an unsaturated hydrocarbon?
- AEthane
- BMethane
- CEthene
- DMore than one of the above
- ENone of the above
Show answer and explanation
Correct answer: (c) Ethene
Explanation
An unsaturated hydrocarbon has at least one carbon–carbon double or triple bond.
Ethene (C₂H₄, CH₂=CH₂) has a double bond, so it is unsaturated. Methane (CH₄) and ethane (C₂H₆) have only single bonds: they are saturated alkanes.