Question

Assertion :Thiophene present in commercial benzene as an impurity can be removed by shaking the mixture with cold concentrated H₂SO₄.

Reason: Thiophene is a heterocyclic aromatic compound.

(a) Both A and R are true and R is the correct explanation of A

(b) Both A and R are true but R is not correct explanation of A

(c) A is true but R is false

(d) A and R are false

Answer 1

Correct option (b) Both A and R are true but R is not correct explanation of A

Explanation:

On shaking with concentratetl H₂SO₄ thiophene being more reactive undergoes sulphonation and the thiophene-2-sulphonic acid thus formed dissolves in concentrated H₂SO_4.