The major product formed when toluene reacts with Br2 in the presence of FeBr3 catalyst is ortho-bromotoluene and para-bromotoluene. The reaction mechanism involved is electrophilic aromatic substitution EAS .Here's the step-by-step reaction mechanism:1. Activation of the halogen: The FeBr3 catalyst reacts with Br2 to form a highly electrophilic bromine ion Br+ . This is represented by the following equation: FeBr3 + Br2 FeBr4- + Br+2. Formation of the sigma complex arenium ion : The electrophilic bromine ion Br+ attacks the aromatic ring of toluene, specifically at the ortho and para positions due to the electron-donating effect of the methyl group. This results in the temporary loss of aromaticity and the formation of a sigma complex arenium ion .3. Deprotonation and regeneration of aromaticity: A base usually the bromide ion, Br- abstracts a proton from the carbon where the bromine ion was added, resulting in the regeneration of the aromatic ring and the formation of the major products, ortho-bromotoluene and para-bromotoluene.4. Regeneration of the catalyst: The FeBr4- ion releases a Br- ion, regenerating the FeBr3 catalyst.The overall reaction can be represented as: Toluene + Br2 ortho-bromotoluene + para-bromotolueneThe major products are ortho-bromotoluene and para-bromotoluene due to the directing effect of the methyl group on the benzene ring, which favors electrophilic attack at the ortho and para positions. The para-bromotoluene is usually the major product because it is less sterically hindered than the ortho-bromotoluene.