A subclass of enzymes which includes all dehydrogenases acting on primary and secondary alcohols as well as hemiacetals. They are further classified according to the acceptor which can be NAD+ or NADP+ (subclass 1.1.1), cytochrome (1.1.2), oxygen (1.1.3), quinone (1.1.5), or another acceptor (1.1.99).

Synonyms: Alcohol Oxidoreductases, Carbonyl Reductases, Reductases, Ketone, Ketone Reductase, EC 1.1.-, Reductase, Carbonyl, Carbonyl Reductase, Reductase, Ketone, Ketone Reductases, Oxidoreductases, Alcohol, Reductases, Carbonyl