Given the task definition and input, reply with output. 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.

A reaction named after Henry Stephens uses nitriles, hydrochloric acid, and tin (II) [tin-two] chloride to form these organic compounds, and after hydrolysis, the Zincke variety can be formed when pyridinium salts with secondary amines. The Corey-Fuchs reaction converts them to alkynes, while the Cannizzaro reaction forms an alcohol and an acid salt using a particular kind of this compound, particularly one lacking the alpha hydrogen. Generally produced by the oxidation of a primary alcohol, it can be tested for using Tollens reagent as it will oxidize to become a carboxylic acid. FTP, name this organic compound with a functional group which consists of a carbon double bonded to an oxygen and single bonded to a hydrogen.
Science