Variable
benzene
2-2-dimethylbutane
2-methylpropane
isoprene
ethyne
ethane
trans-2-butene
n-octane
ethylbenzene
n-butane
propane
n-pentane
cyclo-hexane
toluene
n-hexane
ethene
2-methylbutane
1-butene
cis-2-butene
2-2-dimethylpropane
2-methylhexane