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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 

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In  S_{N}2   reaction, The nucleophile attacks from the less hindered side or the back side in the transition state of the substrate.

Since 1- Bromobutane is a primary alkyl halide and 2- Bromobutane is a secondary alkyl halide hence primary alkyl halide is less hindered than the secondary and secondary alkyl halide is less hindered than the tertiary alkyl halide so 2- Bromobutane gives more hindrance to the nucleophile.

Hence  1- Bromobutane reacts faster than 2- Bromobutane.

Posted by

Devendra Khairwa

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