question_answer 27)

Give a test that can be used to differentiate chemically between butter and cooking oil ? 

Answer:

Butter is saturated in nature while cooking oil is unsaturated. This means that cooking oil has at least one C = C bond present in the constituting compounds while butter does not have any such bond. The distinction between them can be made by reacting with bromine water or bromine dissolved in carbon tetrachloride. Cooking oil will discharge the yellow colour of bromine while butter will not.