In the problem, we are asked which is more viscous between ethylene glycol and pentane.
Recall that viscosity is the resistance of the liquid to flow.
Generally, viscosity is greater with substances with stronger intermolecular forces because if molecules are strongly attached, they do not flow.
The different intermolecular forces are:
Ethylene glycol (HOCH2CH2OH) and pentane (C5H12) are both liquids at room temperature and room pressure, and have about the same molecular weight.
One of these liquids is much more viscous than the other. Which one do you predict is more viscous?