Definition: 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.
Input: They can be synthesized by the McFadyen-Stevens reaction and the Nef reaction, and aromatic examples of them are created by the Gattermann-Koch reaction. Reacting an ester or a nitrile with DIBAL-H and hexane will produce them, and they can be detected by the formation of a silver mirror when exposed to Tollens reagent. They can also be prepared by oxidizing a primary alcohol with potassium dichromate and sulfuric acid, though using a secondary alcohol will give a ketone instead. Such properties are characteristic of, FTP, what class of organic compounds with a terminal carbonyl group, whose simplest member has formula CH2O
Output:
Science