-Why is sugar very soluble in water? -Why is sugar slightly soluble in 70% Isoprophyl Alcohol?
-Why is sugar insoluble in cooking oil?

The bond between the oxygen and hydrogen atoms (O–H bond) in sugar (sucrose) gives the oxygen a slight negative charge and the hydrogen a slight positive charge. ... The polar water molecules attract the negative and positive areas on the polar sucrose molecules which makes sucrose dissolve in water.Sugar dissolves well in water because water is very polar and interacts with the polar areas of sucrose. Sugar does not dissolve very well in alcohol because alcohol has a large part that is pretty non-polar.Oil molecules are not polar so they cannot dissolve either the coloring or the sugar.