Which of the following would be least reactive towards nitration:

Explanation

Addition of nitro group to a compound is called nitration. The reactivity of benzene derivatives towards nitration depends on the presence of electron-donating or electron-withdrawing groups on the benzene ring. Electron-donating groups, such as methyl (CH3), increase the electron density of the benzene ring, making it more reactive towards electrophilic aromatic substitution reactions like nitration. On the other hand, electron-withdrawing groups, such as nitro groups (NO2) or halogens (e.g., chlorine), decrease the electron density of the benzene ring and make it less reactive towards electrophilic substitution reactions. Reactivity of given options for nitration is given as - Toulene > Benzene > Chlorobenzene > Nitrobenzene. So nitro benzene is least reactive towards nitration.