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the claim

The cis isomer dipole moment is always greater than the trans isomer dipole moment

the verdict
REFUTED
the evidence says no
Recorded sources
0 sources for · 2 against

Counts group repeated records of the same source within each side. They do not measure evidence strength or source independence.

Is it true that the cis isomer dipole moment is always greater than the trans isomer dipole moment?

No. The claim that the cis isomer dipole moment is always greater than the trans isomer is refuted by chemical data showing that trans isomers frequently possess larger dipole moments than their corresponding cis counterparts.

Verdict: REFUTED · 0 sources for, 2 against · Last checked

The analysis

The claim states an absolute rule ("is always greater") regarding the relative dipole moments of cis and trans isomers. Multiple retrieved experimental chemistry papers (e.g., [0] and [3]) provide clear counterexamples where the trans isomer has a larger dipole moment than the cis isomer (e.g., cyclopropanecarboxaldehyde and 1,3-pentadiene). Therefore, the claim is definitively refuted by the provided evidence.

Evidence against · 2
Microwave Spectra, Dipole Moments, and Torsional Potential Constants of <i>cis</i>- and <i>trans</i>-Cyclopropanecarboxaldehyde
1971
Measures the dipole moment of cis- and trans-cyclopropanecarboxaldehyde, finding that the trans isomer has a greater dipole moment (3.26 D) than the cis isomer (2.74 D).
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Volltrauer, H. N. & Schwendeman, R. H. (1971). Microwave Spectra, Dipole Moments, and Torsional Potential Constants of <i>cis</i>- and <i>trans</i>-Cyclopropanecarboxaldehyde. doi.org. https://doi.org/10.1063/1.1674602

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More against · 1
Microwave Spectra, Barriers to Internal Rotation of the Methyl Group, and Molecular Electrical Dipole Moments in <i>trans</i>- and <i>cis</i>-1,3-Pentadiene
1970
Measures the dipole moments of cis- and trans-1,3-pentadiene, reporting that the trans isomer has a larger total dipole moment than the cis isomer.
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Hsu, S. L. & Flygare, W. H. (1970). Microwave Spectra, Barriers to Internal Rotation of the Methyl Group, and Molecular Electrical Dipole Moments in <i>trans</i>- and <i>cis</i>-1,3-Pentadiene. doi.org. https://doi.org/10.1063/1.1673098

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What does the evidence say?

The claim states an absolute rule ("is always greater") regarding the relative dipole moments of cis and trans isomers. Multiple retrieved experimental chemistry papers (e.g., [0] and [3]) provide clear counterexamples where the trans isomer has a larger dipole moment than the cis isomer (e.g., cyclopropanecarboxaldehyde and 1,3-pentadiene). Therefore, the claim is definitively refuted by the provided evidence.

Receipt History
first checked05 Aug 2026
judged → REFUTED · 2105 Aug 2026
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