Question

Which amongst the following is an unsaturated hydrocarbon?

• A. Ethyne
• B. Ethane
• C. Pentane
• D. Butane

Answer 1

The correct option is A Ethyne

• Unsaturated hydrocarbons have atleast one double or triple bond between their carbon atoms and are represented by '-ene' or '-yne' as suffix in their IUPAC name.
• Here, ethyne $\left(C_2{H}_2\right)$, the simplest alkyne is the only unsaturated hydrocarbon. Its structure is-

$H-C\equiv C-H$

• Rest all are alkanes, saturated hydrocarbons.