Common Names Named as substituted acetylene. CH3-C=CH methylacetylene CH3 CH3 CH;-CH-CH2-C=CCH-CH3 isobutylisopropylacetylene Chapter 9 Chapter 9 7 Common Names Named as substituted acetylene. CH3 C CH methylacetylene CH3 CH CH3 CH2 C C CH CH3 CH3 isobutylisopropylacetylene =>