Among the given options, the structure that does not contain a hydrophobic structure is option 4: Glycogen.

Hydrophobic substances are those that repel or do not mix well with water. They are characterized by nonpolar molecules or parts of molecules that do not have the ability to form hydrogen bonds with water.

Nylon (option 1) is a synthetic polymer that contains amide groups, which are polar. However, it can have some hydrophobic properties depending on its composition.

Rubber (option 2) is predominantly made up of hydrocarbons, which are nonpolar and hydrophobic in nature.

Linseed oil (option 3) is a triglyceride, which consists of a glycerol molecule attached to three fatty acid chains. The fatty acid chains in triglycerides can be saturated or unsaturated. Unsaturated fatty acids, such as those found in linseed oil, contain double bonds that can introduce some polarity into the molecule, but they are still considered hydrophobic.

Therefore, Glycogen (option 4) is the correct answer as it is a polysaccharide made up of glucose units, which are hydrophilic (water-loving) and have a tendency to form