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By definition, to overcome viscosity we need to apply enough kinetic energy to overcome the intermolecular forces of attraction of a substance. The harder it is to overcome this, the more viscous the substance is. And we all know that hydrogen bonds are the toughest intermolecular bonds to break. This being said if we look at the ethanol molecule it has one hydrogen bond to ether's none. Therefore, more kinetic energy would be required to overcome the attractions by that bond thus increasing the average kinetic energy needed by the substance to overcome or reduce its viscosity.

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