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    apparently 3-bromobut-1-ene and 1-bromobut-2-ene undergo sn1 reactions at the same rate because they form the same allyic carbocation according to my text book, how is this achieved?
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    If you draw out each molecule and then have Br- leave you'll see that they are the carbocation

    hint: the intermediate has two resonance forms
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    have you done anything on carbocations adjacent to double bonds?
 
 
 
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