Ultrasonic velocity (U), density (ρ), and coefficient of viscosity (η) values are measured for solutions containing iodine and one of the following ethers in equimolar concentration in the range 0.001 - 0.01M at 303 K. Diphenyl ether, 4-chloroanisole, anisole and 1,4-dioxane are used as donors. Dichloromethane, chloroform, carbon tetrachloride and n-hexane have been used as solvents. Acoustical parameters such as adiabatic compressibility (β), absorption coefficient (α/f2), internal pressure (πi) and cohesive energy (CE) values are calculated from the values of u, ρ and η. The trend in the acoustical parameters establishes the formation of charge transfer complexes between iodine (acceptor) and ethers (donors). The formation constants (K) are calculated for these complexes. The free energy of formation of these complexes (ΔG) are also reported. Attempt has been made to correlate the formation constants with polarizability (α), dielectric strength (ε) and dipole moment (μ) of the donor and solvent molecules. The free energy of activation (ΔG#) and viscous relaxation time ( ד) are found to be almost constant for these complexes indicating the formation of similar charge transfer complexes in these systems.