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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.

The Cadiot- Chodkiewicz coupling links two of these in the presence of copper (I) chloride catalyst and a base, while in a namesake homologation. The Cory-Fuchs reaction generates these from aldehydes, while reacting them with mercury salt in water yields enols. They can be synthesized by the dehydrohalogenation of vicinal dihalides, and hydrogenating one of these in the presence of palladium on calcium carbonate "poisoned" with quinilone, also known as Lindlar's catalyst. For 10 points, identify this class of compounds, the simplest example of which is acetylene, characterized by a carbon-carbon triple bond.
Output:
Science