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Electrophilic Addition Mechanism

Edexcel AS-level ChemistryAlkenesLesson 10 of 19

Alkenes react with electrophiles by electrophilic addition. The mechanism is shown with curly arrows: each curly arrow shows the movement of a pair of electrons. It starts at a bond or a lone pair and points to where the electrons go.

The mechanism for ethene and bromine happens in two steps.

Diagram

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