Task: Text Categorization
Input (English): The Julia reaction can form one type of these compounds, which can also be produced via dehydrohalogenation in the E2 reaction. The atoms forming their functional group are sp 2 hybridized, and these compounds can be hydrogenated to form saturated compounds in the presence of Raneys catalyst. The E-Z system is used to denote the substituents on these functional groups which can exhibit cis-trans isomerism. For 10 points, identify these organic compounds with carbon-carbon double bonds, whose simplest example is ethylene.
Output (English): Science