Densities and viscosities have been measured for the binary mixtures of chlorobenzene, chlorocyclohexane, bromobenzene, and bromocyclohexane with 2-methyl-1-propanol over the entire concentration range at the temperatures 298.15 K and 313.15 K. These values have been used in the determination of the excess volumes, V-E, and the viscosity deviations, Delta eta. All mixtures present negative values of V-E in a wide region corresponding to the high concentration in alkanol, although this zone becomes smaller at 313.15 K. For Delta eta the mixtures show negative values over the whole composition range at both temperatures.