Q-16. In an electrophilic substitution reaction of nitrobenzene, the presence of nitro group .
(i) deactivates the ring by inductive effect.
(ii) activities the ring by inductive effect.
(iii) decreases the charge density at ortho and para position of the ring relative to meta position by resonance,
(iv) increases the charge density at meta position relative to the ortho and para positions of the ring by resonance,
Ans. (i) and (iii)
Explanation:
Nitro group is electron withdrawing goup according to inductive eefect electron through C—NO2 bond, so ring deactivated .
Nitro group is electron withdrawing group according to resonance. So it decreases the electron density at ortho and para positions.
Comparatively at meta postion electron density is more than ortho and para position, hence electrophile attack at meta postion.
