Choose the compound in each of the following pairs that reacts faster with sodium methoxide in methanol at 50°C:
(a) Chlorobenzene or o-chloronitrobenzene
(b) o-Chloronitrobenzene or m-chloronitrobenzene
(c) 4-Chloro-3-nitroacetophenone or 4-chloro-3-nitrotoluene
(d) 2-Fluoro-1,3-dinitrobenzene or 1-fluoro-3,5-dinitrobenzene
(e) 1,4-Dibromo-2-nitrobenzene or 1-bromo-2,4-dinitrobenzene