2. Arrange the compounds of each set in order of reactivity toward an Sn2 reaction.
a)t-butyl chloride, 1-chloropropane, 1-chloro-2,2-dimethylpropane, 1-chloro-2-methylpropane
b)2-bromopropane, 2-chloropropane, 2-iodopropane
a)t-butyl chloride, 1-chloropropane, 1-chloro-2,2-dimethylpropane, 1-chloro-2-methylpropane
b)2-bromopropane, 2-chloropropane, 2-iodopropane