The dielectric constants of the vapors of the methyl and ethyl halides have been measured in order to obtain accurate values for their dipole moments. The increase in moment from the methyl to the ethyl halide accords with the previously advanced hypothesis of an inductive effect, but the change in the increase with change in the halogen involved points to the influence of an additional factor. The change in moment from compound to compound is compared with the change in the Raman frequency associated with the carbon-halogen bond.
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Smyth et al. (1934) studied this question.
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