Abstract Dipole moments of 2, 4, 6-trialkylated acetophenones (II) and bromobenzenes (III) with variable size of the alkyl groups were measured in two solvents. The main intention was to shed more light on the previous results with similarly substituted nitrobenzenes (I). The comparison reveals a steady decrease of the dipole moment with the increasing size of the alkyl group in all three series. In addition, there is a stronger effect of steric inhibition of ...