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Characteristics of SN2 reaction
✓ An SN2 reaction is a single-step reaction that
occurs without pause (concerted) .
✓Rate of the reaction depends upon
concentration of both reactants (second-order
reaction).
Reaction rate = k [alkyl halide][Nu]
✓ The rate determining step (slow) involves
formation of the transition state.
✓ The SN2 reaction is known as a stereospecific
reaction.
Factors affecting the SN2 reaction
1. Alkyl group reactivity
• There is a steric effect in an SN2 reaction.
• SN2 reactivity: CH3> 1o > 2o > 3o
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