Thiophene and benzene are separated by

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(A) Thiophene is significantly more reactive toward electrophilic aromatic substitution than benzene due to the electron-donating effect of the sulfur

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Sulphonation of thiophene

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(A) Thiophene is significantly more reactive toward electrophilic aromatic substitution than benzene due to the electron-donating effect of the sulfur atom.When a mixture of benzene and thiophene is shaken with concentrated sulfuric acid $(H_2SO_4)$ at room temperature,thiophene undergoes sulfonation to form thiophene$-2-$sulfonic acid,which is water-soluble.Benzene does not undergo sulfonation under these mild conditions.The resulting mixture forms two layers: the organic layer containing benzene and the aqueous layer containing the thiophene-sulfonic acid.These layers can be separated using a separating funnel,effectively isolating the benzene.

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