Which of the following type of alkyl halide is the most reactive w.r.t SN1:

Explanation

Tertiary alkyl halides are the most reactive in SN1 reactions because they have the most stable carbocation intermediates. A carbocation is a carbon atom with a positive charge. In an SN1 reaction, the first step is the ionization of the alkyl halide to form a carbocation. The stability of the carbocation determines how fast the reaction will proceed.Tertiary alkyl halides have the most stable carbocation intermediates because they have three alkyl groups attached to the carbocation carbon atom. These alkyl groups are electron-donating groups, which means that they donate electrons to the carbocation. This delocalizes the positive charge on the carbocation, making it more stable. Therefore, option b is correct.