A group that deactivates the benzene ring towards electrophilic substitution but which directs the incoming group principally to the o- and p-position is.
1. -NH2
2. -Cl
3. -NO2
4. -C2H5
Which one of the following is most reactive towards electrophillic attack?
(a)
(b)
(c)
(d)
The presence of a halogen on the benzene ring in a nitration reaction leads to:
1. | Direct nitro group to come at meta and deactivate the ring due to –I effect of halogen. |
2. | Direct nitro group to come at ortho and para position and deactivate the ring due to –I effect of halogen. |
3. | Direct nitro group to come at meta and activate the ring toward nitration reaction. |
4. | Nitration reaction does not take place due to deactivation caused by –I effect of halogen. |