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Nitrobenzene is more reactive than benzene and toluene due to the presence of the nitro group (-NO2). The nitro group is a strong electron-withdrawing group, which means it pulls electrons away from the benzene ring. This increases the electrophilicity of the benzene ring, making it more susceptible to attack by nucleophiles. In contrast, benzene and toluene do not have electron-withdrawing groups, so they are less reactive.