Variable
benzene
2-2-dimethylbutane
isoprene
ethyne
ethane
cis-2-butene
2-methylpropane
n-octane
n-butane
propane
n-heptane
2-methylpentane
toluene
n-hexane
propene
ethene
2-methylbutane
1-butene
2-methylpropene
2-2-dimethylpropane
2-methylhexane