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Reason for more stable eclipsed conformer of propene, propanal, ethanal

My textbook states that Eclipsed confirmation of propene, ethanal, propanal is the most stable. My friend said that it could be due to dipole-dipole interaction, $\ce{C1}$ of propene is $\delta^+$ and it could interact with H of $\ce{C3}$ to stabilise it, similarly others could be explained. But if we apply similar reasoning to ethylene glycol […]