Can we predict the IMF strength of Acetone vs Glycerol?
So the intermolecular forces would be stronger in glycerol then in acetone. Glycerol can form hydrogen bonds while acetone is not very polar and can’t significantly form h bonds with itself.
The surface tension for glycerol is 63.4 $\frac{mN}{m}$ while acetone is 25.2 $ \frac{mN}{m}$ (both @ 20 C)
I supposed the error in your experiment arises from using pipette to determine the amount of material on the coin. Unless your using very precise pipettes, counting drops isn’t necessarily the best way to quantify the amount of material added. Additionally the density of glycerol is higher then acetone which needs to be accounted for in the test.