> peg doesn't have two hydroxyl groups, it has thousands, because it's not a glycol, it's a polymer of ethylene glycol PEG does have exactly two hydroxyl group

> peg doesn't have two hydroxyl groups, it has thousands, because it's not a glycol, it's a polymer of ethylene glycol PEG does have exactly two hydroxyl groups: one at each end of the polymer chain. The rest are ether linkages, not hydroxyl. You're right that PEG is quite different from ethylene glycol monomer, but be careful accusing people of being ignorant when your own chemistry knowledge is not the best.