${\mathrm{S}}_{\mathrm{N}}1$ reaction is feasible in :

The structure of the major product formed in the following reaction is:

Consider the following bromides:

The correct order of ${\mathrm{S}}_{\mathrm{N}}1$ reactivity is :

The product of the reaction give below is :

The major product formed in the following reaction is :

The major product of the following reaction is :