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Question

Increasing the concentration of an electrophile in a typical SN2 reaction by a factor of 3 and the concentration of the nucleophile by a factor of 3 will change the reaction rate to :

A
increase by a factor of 6
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B
increase by a factor of 9
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C
decrease by a factor of 3
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D
remain about the same
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Solution

The correct option is C increase by a factor of 9
SN2 reactions follow second order kinetics. the rate is proportional to both the concnetrations of substrate and nucleophile i.e. rate = k[Rx][Nu]
Thus increasing the concentration of electrophile and nucleophile by 3 fold each the reaction rate increases by a factor of 9.

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