You are testing the molecular structure and behavior of an unknown compound derived from chemically-digested animal tissue. As part of your molecular assays, you place the unknown compound in an aqueous (water-based) solution to observe its solubility. You are able to observe that the solution containing the unknown molecule separates from the aqueous solution. What can you reasonably conclude from this observation?
a. The unknown compound must be an ionic molecule because it is not water soluble.
b. The unknown compound must be a polar covalent molecule because it is not water soluble.
c. The unknown compound must be a nonpolar covalent molecule because it is not water soluble.
d. The unknown compound must be a lipid, as lipids are by definition not water soluble and the compound was derived from animal tissue.
e. Both c and d.
