Allylic halides have the structure
(a) Show how the first-order ionization of an allylic halide leads to a resonance-stabilized cation.
(b) Draw the resonance structures of the allylic cations formed by ionization of the following halides.
(c) Show the products expected from SN1 solvolysis of these halides in ethanol.
The structure of allylic halide is,
(a) The first-order ionization of an allylic halide and the resonance stabilization is given below-
In this 1st order ionization process, the halide group (X), from the allyl halide has been released as X- ion and forms a carbocation. This carbocation has two resonance structures.
Resonance structures of the allylic cations :-