In each of the following indicate which reaction will occur faster. Explain your reasoning.
(a) CH3CH2CH2CH2Br or CH3CH2CH2CH2I with sodium cyanide in dimethyl sulfoxide
(b) 1-Chloro-2-methylbutane or 1-chloropentane with sodium iodide in acetone
(c) Hexyl chloride or cyclohexyl chloride with sodium azide in aqueous ethanol
(d) Solvolysis of 1-bromo-2,2-dimethylpropane or tert-butyl bromide in ethanol
(e) Solvolysis of isobutyl bromide or sec-butyl bromide in aqueous formic acid
(f) Reaction of 1-chlorobutane with sodium acetate in acetic acid or with sodium methoxide in methanol
(g) Reaction of 1-chlorobutane with sodium azide or sodium p-toluenesulfonate in aqueous ethanol