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Which alkyl halide from the following pairs would you expect to react more rapidly by an S_ N 2 mechanism? Explain your answer. (iii)

10.7      Which alkyl halide from the following pairs would you expect to react more rapidly by an S_{N}2 mechanism? Explain your answer.

      (iii)      

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In these kinds of cases, we see where is the substituent is attached i.e., how far from the halide group. It can be clearly seen that the methyl group attached in 1-bromo-2-methylbutane is near than that attached in 1-bromo-3-methyl butane.

Hence the rate of S_{N}2 reaction will be faster in case of 1-bromo-3-methylbutane.

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