Finding liquid substances polar and nonpolar?

lve got a list of liquid substances and I need to identify which of the substances are the most polar and the most nonpolar. This is not something weve covered yet, so I'm fairly lost. I'm not looking for someone to do the answer for me, maybe just a good explanation of how to figure it out. A couple examples are C7H4 (toluene) and
C3H5(OH3) (glycerol). Thanks for your help guys!

P.S. I understand how to find the electronegativity difference between elements, just not mixtures.

Answer:
a polar substance in definition means that there is a difference in charge between any end and its oppositte end( like right and left or up and down).
but for u to understand it means that molecule is charged( but take notice that not all charged molecules are polar)
so for ur question glycerol is polar and toluene is non polar,
because O is farly more elctronegative than any other atom in the molecule so it attracts electrons more so it has a partly negative charge.
while toluene is not charged since electornegativity bet C and H are very similar so its almost a negligible effect.
a molecule is more polar if it is more highly charged( or in other words with a higher charge density). so u can find it out by looking at how many electonegative atoms in the molecule and the strength of each and figure is out.

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