Question: are sulfhydryl polar or nonpolar?
Answer: The Oxygen as well as Sulfur are highly electronegative although the Sulfur is not nearly as Oxygen. The bonding angle between is not as near 90° as is water or an Alcohol because of the size of the Sulfur ion but sufficiently so to form a compound which is not soluble in Hydrocarbons. The Sulfhydryl group is polar.