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The correct order of reactivity towards the electrophilic substitution of the compounds aniline (I), benzene (II) and nitrobenzene (III) is

1. I > II > III
2. III > II > I
3. II > III > I
4. I < II > III

Correct answer: I > II > III

Solution

Aniline (I) has an electron-donating -NH2 group, making it highly reactive towards electrophilic substitution. Benzene (II) has no substituents, so it is less reactive than aniline. Nitrobenzene (III) has an electron-withdrawing -NO2 group, making it the least reactive.

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