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Generally SN1 reaction is taken as reaarangment reaction 
general formula of rearrangment is
xa + y ---> xy +a  
hydrolysis of tert-butyl bromide with water forming tert-butanol:
(CH3)3-Br + H2O ---> (CH3)3-OH + Br^- + H3O+

2 4 2
can u give an example ?
Refrash the pg and see i edit it
thanks a lot
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