Benzene is highly stable due to aromaticity, preferring substitution over addition. However, under e — Aromatic Hydrocarbons Chemistry Question

💡 Solution & Explanation

Birch reduction adds hydrogens to form 1,4-cyclohexadiene. Catalytic hydrogenation fully saturates the ring to cyclohexane. Reaction with chlorine and UV light triggers radical addition, forming Benzene Hexachloride ($C_6H_6Cl_6$). All three of these break the continuous $\pi$ -system, destroying aromaticity. Friedel-Crafts alkylation is an electrophilic aromatic substitution, which restores the aromatic ring in its final step.