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The variations in the frequencies of some of the Raman lines of methyl and ethyl benzoates and ethyl cinnamate, in phenol and methyl alcohol, have been recorded for different concentrations. In all the three cases the C=O frequencies at 1724, 1719, and 1711 cm-1 are lowered as a result of hydrogen bond formation. This reduction is always accompanied by an increase in the frequencies assigned to the C–O link, which is adjacent to the C=O link. Besides these, variations in other frequencies are reported and explained.