Hydrocarbons in which carbon atoms are linked to each other by double or triple bonds are known as unsaturated hydrocarbons. e.g. Ethene, `(C_2H_4)," ""Ethene"(C_(2)H_(2))` `H-underset(H)underset(|)(C)overset(downarrow)(=)underset(H)underset(|)(C)-H `H-C overset(downarrow)=-H`
