Question

why does NO2 group show its effect only at ortho and para and not at meta???no spam....​

Answer 1

Answer:

Haloalkanes and Haloarenes. Why (-NO2) group shows its effect only at ortho- and para-position and not at meta–position? Presence of nitro group at ortho- and para-positions withdraws the electron density fromthe benzene ring and thus facilitatesthe attack of the nucleophile on haloarene.