Alkene and alkyne both undergo electrophilic additon beacuise of `pi` electron density, they behave as elctron rich species, alknens are more reactive toward this reaction because the intermiediate formed when an`E^(oplus)` adds to an alkyne is a vinylic cation wheras sthe intermediate formed when an `E^(oplus)` adds to akene is alkyl cation, which is mopre stable.
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