The use of slopes of individual variation of the imaginary cr"ij and real cr'ij parts of high frequency (hf) conductivity cr*ij with the weight fractions W/s of a solute is employed to determine relaxation times) 1/ ~ of some monosubstituted anilines in C 6 H 6. The dipole moments Ilj 'S of such polar molecules in terms of estimated) 1/S are calcu lated and compared with those by using the existing methods for 1j (Murthy et al. 198~). Excellent agreement of ill ' S in all cases except

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... e indicates the applicability of both th~ methods. The hf Ilj as well as static Ils differ from Iltheo's as obtained from the available bond angles and bond moments. The reduced bond moments are, however, calculated from the <!stimated Ilj' Il s and Iltheo to yield the exact 11 's in close agreement with Ils and Ilj only to establish the presence of inductive and mesomeric moments of the substituent groups, in addition to solute-solute or solute-solvent molecular associations among the molecules in the solution. The Ilj 's being little affected by the frequency of the electric field, are finally compared with 112 and III (Sit and Acharyya, 1996) due to rotations of the whole and a part of the molecules. They are very close to III indicating the fact that a part of the molecule is rotating under the electric field of 10 GHz.