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.

         (i)      CH_{3}CH_{2}CH_{2}CH_{2}Br  or 

Answers (1)

In this case, the rate of S_{N}2   reaction will depend on the hindrance of the substrate.

Since 1- Bromobutane is a 1^{\circ} alkyl halide and 2- Bromobutane is a 2^{\circ} alkyl halide hence 2- Bromobutane gives more hindrance to the nucleophile.

Hence  1- Bromobutane reacts faster.

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