The most characteristic reaction of alkenes is

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Alkenes typically undergo addition reactions, where a molecule adds across the double bond. This is due to the high electron density of the double bond, which makes it susceptible to attack by electrophiles. Substitution reactions are not as common for alkenes, as they typically require a strong electrophile and a leaving group on the alkene. Dehydrogenation and dimerization reactions are possible for certain alkenes, but they are not as characteristic as addition reactions. Elimination reactions can also occur, but they usually require strong bases or high temperatures to break the double bond.

The Most Characteristic Reaction of Alkenes Is