Final answer:
The slow step in SN1 reactions is the formation of carbocation, involving the cleavage of the C-X bond.
Explanation:
Formation of carbocation is the slow step in SN1 reactions, as it involves the cleavage of the C-X bond to form the carbocation intermediate, which is the rate-determining step in the mechanism. This step is slow due to the high activation energy required for bond cleavage.
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