| Section2 = | Section7 = | Section8 = }} Butane, also called n-butane,'s the unbranched alkane with four carbon atoms, CH3CH2CH2CH3. Butane's also used as a collective term for n-butane together with its only other isomer, isobutane (also called methylpropane), CH(CH3)3. Butanes are highly flammable, colorless, odorless, easily liquefied gases. The name butane comes from the roots but- (from butyric acid) and -ane. Rotation about a central C-C bond produces two different conformations (trans a… (More on N-butane)