Allylic And Vinylic Carbocation Stability

The reason being is the positive charge directly on a double bond so we can t draw any the resonant structures. But carbocation 5 is vinylic carbocation positively charged carbon is sp 2 hybridized i e. The rate of this step and therefore the rate of the overall substitution reaction depends on the activation energy for the process in which the bond between the carbon and the leaving group breaks and a carbocation forms.

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