Which of the following liquids is expected to have the highest viscosity at room temperature?

Adiethyl ether
Bethanol
Cethane- $1, 2$ -diol
Dpropane- $1, 2, 3$ -triol (glycerol)

Answer: D

Viscosity rises with the extent of intermolecular hydrogen bonding. Glycerol has three OH groups per molecule and forms the most extensive hydrogen-bonded network, so it is the most viscous. Ethanol (one OH) and ethane-

1, 2

-diol (two OH) are less so, and diethyl ether has no O-H.

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