Answers
Water - polar
Hexane - nonpolar
Methanol - polar
1-octanol - polar
Acetone - polar
3-pentanone - polar
2-pentanol - polar
Ethylene glycol - polar
(Ethylene glycol may seem to be nonpolar as it has two terminal hydroxyl group seems canceling out each others dipole moment. But if you draw newman projection of ethylene glycol, the gauche confirmation is most stable which contributes most and hence making it polar.)
(Normal hydrocarbon chains are generally nonpolar.)
Hydrocarbon chains having hydroxyl group is polar.
Ketonic group is always polar.
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