1•The characteristic reaction of alkenes is addition—the πbond is broken and two new σbonds are formed.1. Addition Reactions•Alkenes are electron rich, with the electron density of the πbond concentrated above and below the plane of the molecule1bond concentrated above and below the plane of the molecule. •Therefore, alkenes act as nucleophiles and react with electrophiles.•Simple alkenes do not react with nucleophiles or bases, reagents that are themselves electron rich. ENuδ+δ−E1. Addition ReactionsCCCC+Nu2
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