need help with chem

for 1-propanol with NaBr and sulfuric acid, can I assume the mechanism is SN2 because the alcohol is on a primary carbon? I"m confused because when I write out the reaction, there will be a primary carbocation, and I'll have to do a shift right? I thought...

My products were traced by the GC and when given back to me, there are numerous peaks and a list of different areas of the peaks. I still don't get how the peaks and areas given can help me determine what mechanism it was.