Consider the structures of the alkyl halides shown, and select all the statements that correctly describe the relative reactivity of these compounds in an SN1 reaction.
1) The reactivity of the alkyl halides increases with increasing alkyl group size.
2) The reactivity of the alkyl halides decreases with increasing alkyl group size.
3) The reactivity of the alkyl halides is not affected by the size of the alkyl group.
4) The reactivity of the alkyl halides is determined solely by the nature of the halogen atom.