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IB Chemistry HL question

Why is Sn1 mechanism faster than Sn2 in nucleophilic substitution reactions of halogenoalkanes?
Reply 1
What's the difference in the two mechanisms?
Reply 2
Tertiary halogenoalkanes react using Sn1. It involves the formation of a stable Carbocation

Primary halogenoalkanes react using Sn2. It involves the formation of an unstable transition state.

Secondary can react using either I think.


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Reply 3
Check out the activation energies for the two processes. One is lower than the other.

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