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I think it is more understandable if you consider the surface tension as an average value of attraction between the liquid molecules. A nonpolar hydrocarbon is a bond of Van der Waals force only, and a stronger hydrogen bond will be added in case it is water. Since a part of the hydrogen bond between water molecules will be cut by the dissolution (hydration) of the organic compounds, the coaction between the molecules as an average will decrease and the surface tension will be weakened.