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Glycerol (propane-1, 2, 3-triol) is more...

Glycerol (propane-1, 2, 3-triol) is more viscous than ethylene glycol (ethane-1, 2-diol).

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Viscosity depends on the amount of hydrogen bonding between molecules and presence of more `-OH` groups, glycerol involved in intramolecular hydrogen bonding within the molecule, has 3OH groups per molecule whereas ethylene glycol has 2OH groups per molecule, thus glycerol is more viscous than ethylene glycol.
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