Question

Why glycerol is more viscous than water and ethanol?

Answer 1

Answer:

We normally meet glycerol as a rather syrupy colourless liquid, much more viscous than water or alcohol. ... These three OH groups can bind to other hydroxyl groups, either in water molecules – which makes glycerol very soluble in water – or by hydrogen-bonding with other glycerol molecule

Answer 2

Answer:

Higher is the extent of hydrogen bonding, higher will be the viscosity.

In case of Glycerol, 3 -OH groups are involved in Hydrogen bonding whereas in case of ethanol only one -OH group is involved, therefore the extent of Hydrogen bonding in ethanol is lower than glycerol and hence the viscosity.

Explanation:

Higher is the extent of hydrogen bonding, higher will be the viscosity. In case of Glycerol, 3 -OH groups are involved in Hydrogen bonding whereas in case of ethanol only one -OH group is involved, therefore the extent of Hydrogen bonding in ethanol is lower than glycerol and hence the viscosity

i have attached a strucre diagram also

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