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S(N)1 reactions are extremely uncommon i...

`S_(N)1` reactions are extremely uncommon in gas phase-why?

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In the rate-determining step (the 1st step) of an `S_(N)1` reaction, a carbocation and and an anion are obtained. The more the ions are solvated, the more they become stable and the easier is the cleavage of the C-L bonds, hence, faster is the `S_(N)1` reaction. Solvent is absent in the gas phase and so, there is no question of stabilization of ions by solvation. For this reason, `S_(N)1` reactions are extermely uncommon in the gas phase.
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