Has both aldehyde and alcohol dehydrogenase activities. Can use acetaldehyde, butyraldehyde, butanol and ethanol. a primary alcohol + NAD(+) = an aldehyde + H(+) + NADH a secondary alcohol + NAD(+) = a ketone + H(+) + NADH an aldehyde + H2O + NAD(+) = a carboxylate + 2 H(+) + NADH Induced during switch to solvent production. In the N-terminal section; belongs to the aldehyde dehydrogenase family. In the C-terminal section; belongs to the iron-containing alcohol dehydrogenase family.