Predict whether you would be able to smell these substances. Explain your reasoning.
decanol, $\mathrm{C}_{10} \mathrm{H}_{22} \mathrm{O} \quad$ lead, $\mathrm{Pb} \quad$ iron oxide, $\mathrm{Fe}_{2} \mathrm{O}_{3} \quad$ potassium chloride, $\mathrm{KCl}$