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

Dear Student,

@ shrinidhi,

Well done! You have given the correct explanation for the asked question.

Hydrocarbons are colorless. Bromine dissolved in water or trichloroethane solvent forms an orange (yellow/brown) solution. When bromine solution is added to both butter or cooking oil the result is quite different. The butter solution remains orange.

As cooking oil is unsaturated compound so it decolorises the bromine as it forms a colourless dibromo- addition product.

 Cooking oil  +  Br2  →  Addition product

                     (Orange)       (colorless)

   Butter  +  Br2  →  No reaction

           (Orange)        (Orange) 

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 we can distinguish between cooking oil and butter by bromine water test:-

  • add bromine water to little of cooking oil and butter taken in different test tubes
  1. cooking oil decolourises bromine water showing that it is an unsaturated compound
  2. butter doesn't decolourise bromine water showing that it is a saturated compound
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note:-

  • bromine water has a reddish brown or light orange colour due to the presence of br2 unit.
  • when bromine is added to unsaturated compounds,then bromine gas gets discharged<becomes colourless>.
  • so if an organic compound decolourises bromine water , then it will be an unsaturated compound.

hope it helps!!!!

cheers,

shri

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