Question

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

I had it on my test for class XII.

Answer 1

butter and ghee contain glycerides of saturated fatty acids.  The carbon atoms in these compounds have single bonds among them.
Cooking oil contains glycerides of unsaturated fatty acids.  THe carbon atoms have  double or triple bonds among them.

Bromine test can be done to differentiate between saturated and unsaturated compounds.
When a drop of bromine is added to an unsaturated compound, its (bromine's) brown color disappears due to a reaction.  With saturated compoinds, bromine does not react, so there is no change in color

Smoking test
Butter has a much lower smoking point (this is the temperature, when we are cooking in butter or oil,  at which bluish smokes come out of the fatty compoinds.

Taste  ;  butter gets overheated, gets burnt, and tastes bad if it is heated to high temperatur.
Oil does not taste so bad upt to a much higher temperature.

Answer 2

Answer:

BTS

please mark me as brainliest

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.