Because of the small difference between the electronegativities of carbon and hydrogen, alkanes have very small dipole moments, so small that they are difficult to measure. For example, the dipole moment of isobutane is 0.132 D37 and that of propane is 0.085 D.38 Of course, methane and ethane, because of their symmetry, have no dipole moments.39 Few organic molecules have dipole moments >7 D.
Because of the small difference between the electronegativities of carbon and hydrogen, alkanes have very small dipole moments, so small that they are difficult to measure. For example, the dipole moment of isobutane is 0.132 D37 and that of propane is 0.085 D.38 Of course, methane and ethane, because of their symmetry, have no dipole moments.39 Few organic molecules have dipole moments >7 D.
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