Which mechanism causes increased separation in gas chromatography peaks at higher molecular weights in a homologous series?

💡 Explanation

When molecular weight increases in a homologous series, dispersion forces (van der Waals) increase because larger molecules have more electrons and surface area for induced dipoles, leading enhanced retention and thus increased peak separation in chromatography. Therefore, enhanced van der Waals interactions results, rather than Stark broadening, decreased dipole interactions, or hydrogen bond suppression, which are less molecular weight dependent.

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