For the following reaction,use the identity of the alkyl halide and nucleophile to determine which substitution mechanism occurs.Then determine which solvent affords the faster reaction. 
Definitions:
Fracture
A break or crack in a rock; subdivided into joints and faults.
Rock Layers
Strata or sequences of rock sediment that have accumulated over time, each layer representing a specific era in geologic history.
Youngest Unit
The most recently formed or deposited geological layer or structure in a sequence.
Logrolling
A political term denoting the practice of exchanging favors, especially in legislative contexts, but can also refer to reciprocal arrangements in other areas.
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