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Question: Answered & Verified by Expert
Assertion : Thiophene present in commercial benzene as an impurity can be removed by shaking the mixture with cold concentrated $\mathrm{H}_2 \mathrm{SO}_4$.
Reason : Thiophene is a heterocyclic aromatic compound.
ChemistryGeneral Organic ChemistryAIIMSAIIMS 2017
Options:
  • A If both assertion and reason are true and reason is the correct explanation of assertion.
  • B If both assertion and reason are true but reason is not the correct explanation of assertion.
  • C If assertion is true but reason is false.
  • D If both assertion and reason are false.
Solution:
2015 Upvotes Verified Answer
The correct answer is: If both assertion and reason are true but reason is not the correct explanation of assertion.
On shaking with concentrated $\mathrm{H}_2 \mathrm{SO}_4$ thiophene being more reactive undergoes sulphonation and the thiophene-2-sulphonic acid thus formed dissolves in concentrated $\mathrm{H}_2 \mathrm{SO}_4$.

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