The rate of SN1 reaction is fastest with: (a) (b) (c) CH Br CH NO2 Br (d)

The 1 N S reaction works with the formation of a carbocation. The fastest rate of this reaction depends on the stability of the carbocation. The stability of the carbocation increases with the delocalization of the positive charge. Also, the presence of the electron- donating group increases the stability of carbocation whereas the presence of electron-withdrawing group the carbocation destabilises. When there is a phenyl group present adjacent to the carbocation, the positive charge delocalizes and it becomes stable. Let us look at the options: Option A: Here, after the bromine leaves, the ca