1, 2-Ethanediol exists to a much greater extent in the gauche conformation than does 1, 2-dichloroethane. Explain....

Question:

1, 2-Ethanediol exists to a much greater extent in the gauche conformation than does 1, 2-dichloroethane. Explain. Would you expect the gauche: anti conformational ratio of 2-chloroethanol to be similar to that of 1,2-dichloroethane or more like that of 1,2-ethanediol?