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In the electrophilic addition reaction there are two transition states since there are two steps. Each step correlates with a differing transition state. In the first transition state, the double bond breaks between two carbons, and the electrophile (ex.H-Br) attaches through a tentative bond with the carbon on one side of the broken double bond. This creates a carbocation on the other side of the bond, where in transition state 2, the Br- breaks and forms a bond with the carbocation. This leads into the final product where H and Br are now attached to the original structure, and there is no double bond present any longer within the molecule.
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