In this chapter, we’ve looked at some consequences of alkene stereoisomerism and at the details of the broadest class of alkene reactions—the electrophilic addition reaction An alkene is a hydrocarbon that contains a carbon-carbon double bond.

Because they contain fewer hydrogens than alkanes with the same number of carbons, alkenes are said to be unsaturated Because rotation around the double bond can’t occur, substituted alkenes can exist as cis-trans stereoisomers.

alkene — a hydrocarbon that contains a carbon-carbon double bond. higher-ranking groups on each carbon — on the same side of the double bond, the configuration is Z ( zusammen, “together”); if the higher-ranking groups on each carbon are on opposite sides of the double bond….