Detailed Instructions: In this task you will be given a text passage from a trivia quiz. You should choose the category this question belongs to from these categories: History, Science, Social Science, Fine Arts, Literature. You can only choose one category, so if in doubt, please choose the closest match.
Q: One variety of them formed from secondary imines such as pyrimidine are named for Zincke. Two equivalents of these compounds yield a carboxylic acid and a primary alcohol in a disproportion reaction named for Cannizaro. They are characterized by an NMR shift of about 9 to 10 ppm, and their oxidation in the presence of a diamine-silver complex yields a "silver mirror" in the Tollens test. For 10 points, identify this functional group which features a carbon double bonded to an oxygen atom and single bonded to a hydrogen atom, exemplified by methanal and ethanal.
A:
Science