Properties Of Benzene

Step 1: Nitration of aromatic compounds.
In electrophilic aromatic substitution reactions, typically attacks the meta position in compounds that have electron-withdrawing groups attached at the ortho and para positions. Based on the structures, attacks at the meta position in compounds I, II, and III.
Thus, the correct answer is (1).

Step 1: Reaction of benzene with D₂SO₄ causes sulphonation.
Step 2: In presence of D₂O, electrophilic aromatic substitution also leads to H–D exchange on the ring.
Step 3: Hence product is a sulphonated benzene containing one deuterium atom on the ring and SO₃D group.