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SOLUTION E18.1b

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The second reaction is faster. The substrate is the same, but the leaving group is not. When alcohols are put in acidic solutions, the OH can be protonated to make a better leaving group (R-OH2+ vs R-OH). In both SN1 and SN2 reactions, the type of leaving group affects the activation energy.

The rates are the same. The substrates, leaving group, and nucleophile are the same. The concentration of nucleophile is greater in the second reaction, but nucleophile concentration is not included in rate equation for SN1 reactions - the rate is only dependent on the concentration of the alkyl halide in SN1 reactions.
 

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