CBSE Class 12-science Answered
which are meta ortho and para generating groups?
Asked by zrajani | 01 May, 2012, 08:04: PM
Expert Answer
Electron donating groups (EDG) with lone pairs (e.g. -OMe, -NH2) on the atoms adjacent to the p system activate the aromatic ring by increasing the electron density on the ring through a resonance donating effect. The resonance only allows electron density to be positioned at the ortho- and para- positions.
| Electron withdrawing groups (EWG) with p bonds to electronegative atoms (e.g. -C=O, -NO2) adjacent to the p system deactivate the aromatic ring by decreasing the electron density on the ring through a resonance withdrawing effect. The resonance only decreases the electron density at the ortho- and para- positions. Hence these sites are less nucleophilic, and so the system tends to react with electrophiles at the meta sites. |
Answered by | 02 May, 2012, 02:17: PM
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