1.

Assertion : Thiophene present in commercial benzene as an impurity can be removed by shaking the mixture with cold concentrated H_(2)SO_(4). Reason : Thiophene is a heterocyclic aromatic compound.

Answer»

If both assertion and reason are true and the reason is the correct explanation of the assertion.
If both assertion and reason are true but RESON is not the correct explanation of the assertion.
If assertion is true but reason is false.
If the assertion and reason both are false.

Solution :On SHAKING with CONCENTRATED `H_(2)SO_(4)` THIOPHENE being more reactive undergoes sulphonation and the thiophene- 2-sulphonic acid thus formed dissolves in concentrated `H_(2)SO_(4)`.


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