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AP EAMCET202125 Aug 2021Morning ShiftChemistryAlcohols Phenols and EthersActual

Which reaction of ethanol will decolourise bromine water?

Options

  1. AC ₂ H ₅ OH + HBr C ₂ H ₅ Br + H ₂ O
  2. B2 C ₂ H ₅ OH [413 ~K ] H ⁺ C ₂ H ₅- O - C ₂ H ₅+ H ₂ O
  3. CC ₂ H ₅ OH + Na C ₂ H ₅ ONa + 1 2 H ₂ O
  4. DC ₂ H ₅ OH [443 ~K ] H ⁺ C ₂ H ₄+ H ₂ O

Correct answer

D. C ₂ H ₅ OH [443 ~K ] H ⁺ C ₂ H ₄+ H ₂ O

Step-by-step solution

One of the product in this reaction is ethene, an unsaturated hydrocarbon. It decolourises bromine water. Bromine solution is the classic test for the detection of unsaturation. A few drops of bromine water to the test tube with the ethanol produce reddish-brown colour.

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