Choose the member of each pair that will react faster by the SN1 mechanism.
(a) 1-bromopropane or 2-bromopropane
(b) 2-bromo-2-methylbutane or 2-bromo-3-methylbutane
(c) n-propyl bromide or allyl bromide
(d) 1-bromo-2,2-dimethylpropane or 2-bromopropane
(e) 2-iodo-2-methylbutane or tert-butyl chloride
(f) 2-bromo-2-methylbutane or ethyl iodide