Since butane exhibits this type of enantiomerism, does this mean that butane is chiral? It does not. Individual conformations of butane may be chiral, but the conformations of butane interconvert so rapidly that neither chiral conformation can be isolated. On average, butane is still achiral. The general rule concerning conformational enantiomers is as follows: any molecule analyzed for chirality must be conformationally stable. A molecule is not considered chiral if it is in rapid equilibrium with its mirror image.