Identify the alkyl halide that reacts the fastest in a S_N2 reaction. A) 2-chloro-2-methylpropane B) 1-chlorobutane C) 2-chlorobutane D) chloromethane Identify the alkyl halide that reacts the fastest in an S_N1 reaction. A) 2-bromopropane B) 2-iodopropane C) 2-fluoropropane D) 2-chloropropane (CH_3)_3CBr + I rightarrow (CH_3)_3CI + Br Assuming no other changes, what is the effect of doubling only the concentration of the nucleophile in the above reaction? A) no change B) doubles the rate C) triples the rate D) quadruples the rate E) rate is halved