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Q.

The correct order of viscosity of alcohol, ethylene glycol and glycerol is :

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a

glycol > glycerol > alcohol

b

glycerol > glycol > alcohol

c

alcohol > glycerol > glycol

d

alcohol > glycol > glycerol

answer is B.

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Detailed Solution

Glycerol contains three -OH groups per molecule, whereas ethylene glycol (1,2-dihydroxyethane) contains two. The amount of hydrogen bonding between molecules determines viscosity, and the more -OH bonds there are, the more hydrogen bonding can occur. As a result, glycerol is more viscous than glycol and alcohol.

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