Concept:Saturated hydrocarbons contain only single bonds, while unsaturated hydrocarbons contain double or triple bonds. A triple bond makes a hydrocarbon highly unsaturated.
Explanation:The compounds listed include alkanes, an alkene, and an alkyne.
CH4 and
C4H10 are alkanes, which are saturated.
C2H4 is ethene, an alkene with one double bond, so it is unsaturated.
C2H2 is ethyne, an alkyne with a carbon-carbon triple bond.
Because the triple bond creates a higher degree of unsaturation than a double bond,
C2H2 is the highly unsaturated hydrocarbon.
Answer:A.
C2H2