The decreasing order of surface tension of the given molecules are,
CH3OH > H2C=O > CH3CH3
A molecule's surface tension falls as the surface tension get weaker. Here, every molecule that is there has a hydrogen bond. It is well known that as the number of O-H bonds in a given molecule increases, so does the degree of hydrogen bonding. Strong intermolecular forces are believed to exist between molecules with more H-bonds, whereas weak surface tension forces are stated to exist between molecules with fewer H-bonds.
Molecule (a) in this case possesses one H-bond, molecule (b) displays dispersion forces, and molecule (c) displays dipole-dipole forces. Dipole-dipole forces are stronger than dispersion forces, and H-bond is stronger than both surface tension forces.
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