Question

Which of the following liquids has the highest viscosity ?

• A. Benzene
• B. Carbon disulphide
• C. Acetone
• D. Ethanol

Answer 1

The correct option is D Ethanol

We know, viscosity increases with increase in the intermolecular forces.
The molecular formula of benzene is $C_6{H}_6$
The molecular formula of carbon disulphide is $C{S}_2$
The molecular formula of acetone is $C{H}_{3}COC{H}_3$
The molecular formula of ethanol is $C{H}_{3}C{H}_{2}OH$
Thus, intermolecular H-bonding exists only in ethanol unlike other liquids, hence it has strongest intermolecular attractions and accordingly has the highest viscosity.