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SOLUTION E21.1a

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The second reaction is faster. Substrate and base are the same, but -OCH3 acts as a stronger base in aprotic solvent (DMF). In E2 reactions, strength of base affects the activation energy.
The second reaction is faster. Substrate and base are the same, but concentration of base is greater in the second (twice as much, so twice as fast). In E2 reactions, concentration of base affects the rate as it is part of the rate equation.
 

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