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Arrange the following set of compounds ...

Arrange the following set of compounds in order of their decreasing relative reactivity with an electrophile,`E^+`.
Toluene, `p-H_3C-C_6H_4-NO_2, p-O_2N-C_6H_4-NO_2`

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Electron density of the benzene nucleus increases in presence of electron-donating group (activating group). Consequently, electrophiles can easily attack the benzene nucleus. On the other hand, electron density of the benzene nucleus decreases in presence of electron-withdrawing group (deactivating group). This makes electrophillic substituation difficult for the benzene nucleus.
Therefore, order of the different compounds according to their decreasing relative reactivity with an electrophile `E^(+)` is-
Toluene `gt p-CH_(3)C_(6)H_(4)NO_(2) gt p.O_(2)NC_(6)H_(4)NO_(2)`
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CHHAYA PUBLICATION-HYDROCARBONS-SOLVED NCERT EXERCISE
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