Octanoic acid and octanol differ in molecular structure by one oxygen molecule. when smelling these substances,

Since the two differ in molecular structure, their recognition profiles for the two substances are very different. Substance identification is a procedure by which the distinctiveness of the substance is recognized. Octanoic acid is the eight-carbon straight chain fatty acid while octanol is a fatty alcohol.

nacl or sodium chloride is an ionic compound. this is because an ionic compound pertains to a compound that consists of positively and negatively charged ions. in this case, na (sodium) has a tendency to lose one electron when it reacts with with other atoms, so the resulting sodium ion contains 11 protons and 10 electrons, thus making it positively charged (na+), when chlorine reacts, it usually gains one electron to form an ion called chloride, thus making it negatively charged ( since the ions are oppositely charged, they attract.