Suppose you are assigned two unknowns, compound a and compound b. one unknown is a fat, while the other is an oil. you dissolve a small amount of compound a in cyclohexane. after you add 4 drops of a cyclohexane solution containing bromine, the reaction mixture retains the bromine color. when you add the bromine solution to compound b, the bromine color remains after you add 1 drop of the test solution. which substance, a or b, is more likely to be an oil?