Twin: The Addition Reaction
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An addition reaction breaks a double or triple bond's pi component and forms two new single bonds, one to each carbon, changing their hybridization.
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Bromine adds across ethene's double bond, converting the sp2 carbons to sp3 and yielding 1,2-dibromoethane.
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Addition happens at an existing multiple bond and changes carbon hybridization — confusing it with the mechanism named next is this twin's target.