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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 disproportionation reaction using this type of compounds in the presence of alcoxides to yield esters is named for Tischenko, while another type can be formed by reacting a secondary amine with a pyridinium salt. In the presence of a strong base, two equivalents of these yield an alcohol and a carboxylic acid in the Cannizzaro reaction. They can be reduced to primary alcohols, and they react with a set of alkyl ammonium compounds to form a silver mirror in the Tollens test. For 10 points, identify these compounds which feature a carbon double bonded to an oxygen and single bonded to an alkyl group and a hydrogen, exemplified by etha-nal and propa-nal.
Output:
Science