Pentane is an organic compound with the formula C5H12 — that is, an alkane with five carbon atoms. The term may refer to any of three structural isomers, or to a mixture of them: Common name normal pentaneunbranched pentanen-pentane isopentane neopentane IUPAC name pentane methylbutane dimethylpropane Moleculardiagram Skeletaldiagram In the IUPAC nomenclature, however, pentane means exclusively the n-pentane isomer; the other two being called "methylbutane" and "dimethylpropane". Pentane… (More on Pentane)