Reactivity of alkyl halides towards SN1 nucleophilic substitution reaction is:

Reactivity of alkyl halides towards SN1 nucleophilic substitution reaction is 3o > 2o > 1o because in SN1 nucleophilic reaction , the first and the slow step is the formation of a carbocation. Tertiary carbocation is more stable than a secondary carbocation which is more stable than a primary carbocation. Greater the stability of the carbocation, greater will be the ease of formation of carbocation, and hence faster will be the rate of the reaction.

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