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# Which alkyl halide from the following pairs would you expect to react more rapidly by an SN2 mechanism? Explain your answer. - Chemistry

#### Question

Which alkyl halide from the following pairs would you expect to react more rapidly by an SN2 mechanism? Explain your answer.

CH_3CH_2CH_2CH_2Br or

#### Solution

2-bromobutane is a 2° alkylhalide whereas 1-bromobutane is a 1° alkyl halide. The approaching of nucleophile is more hindered in 2-bromobutane than in 1-bromobutane. Therefore, 1-bromobutane reacts more rapidly than 2-bromobutane by an SN2 mechanism.

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