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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.

One method of producing this functional group involves an elimination and then expulsion of sulfur dioxide from an alpha-halo sulfone in the Ramberg-Backlund reaction. Also produced form the treatment of tosylhydrazones with strong base in the Bamford-Stevens reaction, this functional group changes positions in the Cope rearrangement. Shrock carbenes and Fischer carbenes catalyze a reaction switching the substituents of two of these compounds, and Lindlar's catalyst is used to produce their cis examples stereoselectively. They are most easily produced in Zaitsev elimination of alkyl halides, and two of them are crossed in a namesake metathesis. For 10 points, name these compounds with formula CnH2n, the simplest example of which is ethylene.
Output:
Science