On increasing temperature, dissociation of benzoicacid is not possible in benzene. So number ofparticles remains the same i = 1 δTb = 83.1 - 80.1 = 3)C or 3K ΔTb = ikb . m m = 1.17 mol/kg On decreasing temperature, it dimerises throughintermolecular H-Bonding.