# Which one is more stable: anti conformation or gauche of Newman projection for ethane-1,2-diol? Why?

Ordinarily, we would predict that the anti conformation would be the most stable. Certainly it would be for the ${C}_{2} - {C}_{3}$ conformers of $\text{n-butane}$.
For $H O C {H}_{2} C {H}_{2} O H$ there is certainly the possibility of intramolecular hydrogen bonding, in which the electropositive hydroxyl hydrogen is electrostatically attracted to the electronegative oxygen on the alternate hydroxyl group. Make a model, and make a few predictions.......