Because the transition state for alkene protonation resembles the carbocation product, we can imagine it to be a structure in which one of the alkene carbon atoms has almost completely rehybridized from sp2 to sp3 and in which the remaining alkene carbon bears much of the positive charge. This transition state is stabilized by hyperconjugation and inductive effects in the same way as the product carbocation. The more alkyl groups that are present, the greater the extent of stabilization in the transition state uation by showing competing reaction energy profiles for the reaction of 2-methylpropene with HCl