25 points each! A molecular chain of C and H atoms has the formula C20H42, has moderate viscosity, and is not soluble in water. Make two modifications to the chemical structure to achieve different physical properties. Discuss the new atoms/bonds would be present in the molecule after the change.

The first change should increase the viscosity while leaving the molecule insoluble in water.

The second change should further increase the viscosity of the substance while increasing its solubility in water.