Question

Give a chemical test to distinguish between butter and cooking oil
.

Answer 1

Cooking Oil is a unsaturated compound whereas butter is saturated.

Bromine water test:-

When oil is added to bromine water the reddish- brown colour of solution changes to colourless.

But when a saturated compound (butter) is added to bromine water then no change occurs.

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Answer 2

Answer:

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Butter is a saturated carbon compound while cooking oil is an unsaturated carbon compound. An unsaturated compound decolourises bromine water, while a saturated compound cannot decolourise it. So we can distinguish chemically between a cooking oil and butter by the bromine water. Add bromine water to a little of cooking oil and butter taken in separate test-tubes.

(1)Cooking oil decolourises bromine water showing that it is an unsaturated compound.

(2)Butter does not decolourise bromine water showing that it is a saturated compound.