Pentane exists as three isomers : `` n '' - pentane ( often called simply `` pentane '' ) , isopentane ( 2-methylbutane ) and neopentane ( dimethylpropane ) .
Pentane has three isomers . They are `` n '' - pentane ( often called simply `` pentane '' ) , isopentane ( methylbutane ) and neopentane ( dimethylpropane ) .