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SN1 or SN2: spot the mechanism mismatch

Single question

One step: 1-bromobutane plus methanol gives butyl methyl ether. The conditions claim SN1 solvolysis: aqueous methanol, no added base, reflux. Read the substrate carefully.

SN1 vs SN2 selection
Carbocation stability
Primary substrates strongly prefer SN2

Find the flaw

Click the step that contains the flaw, or pick “No flaw” if you think every step is correct.

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