I believe that it is just an addition reaction with 3-methyl-cyclohexene and HBr. However, the Br ends up being on the same carbon as the methyl group. I thought that the Br should go to the carbon with the positive charge. I do not understand how this is the product.I am wondering if this is even an addition reaction, or if its SN1, SN2, E1 or E2
Hey there! You're right that it's an addition reaction, more specifically a hydrohalogenation reaction. This reaction forms a carbocation intermediate which can do shifts. For this specific problem, the cation did a 1,2 hydride shift to a tertiary position. I've posted the mechanism below. I hope this helps!