Question

# Increasing the concentration of an electrophile in a typical $$S_{N^{2}}$$ 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
B
increase by a factor of 9
C
decrease by a factor of 3
D

Solution

## The correct option is C increase by a factor of $$9$$$$S_N2$$ reactions follow second order kinetics. the rate is proportional to both the concnetrations of substrate and nucleophile i.e. rate = k[Rx][N$$\overset { \ominus }{ u }$$]Thus increasing the concentration of electrophile and nucleophile by 3 fold each the reaction rate increases by a  factor of 9.Chemistry

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