Which of the following liquids has the highest viscosity ?

Benzene

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Carbon disulphide

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Acetone

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Ethanol

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Solution

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 $C H_{3} C O C H_{3}$
The molecular formula of ethanol is $C H_{3} C H_{2} O H$
Thus, intermolecular H-bonding exists only in ethanol unlike other liquids, hence it has strongest intermolecular attractions and accordingly has the highest viscosity.

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