Question

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

Answer 1

Viscosity depends on the amount of hydrogen bonding between molecules and presence of more $-OH$ group, glycerol involved in intramolecular hydrogen bonding within the molecule, thus glycerol is more viscous than ethylene glycol.