Benzene can undergoes only reaction of?

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Benzene behaves this way because its ring is aromatic and highly stabilized. Reactions that preserve this aromatic stabilization are favored, while adding across the ring would break aromaticity and is thus unfavorable. The typical reaction is substitution, where an electrophile replaces one hydrogen on the ring without losing the aromatic character. Mechanistically, the electrophile temporarily disrupts aromaticity to form a non-aromatic intermediate, then deprotonation restores the aromatic ring, yielding a substituted benzene. Classic examples include nitration, chlorination, and sulfonation, as well as Friedel–Crafts alkylation or acylation. That’s why the correct choice is substitution.