CBSE Class 11-science Answered
Why M effect does not operate on Meta position
Asked by up558486 | 28 Oct, 2021, 12:41: PM
To understand better lets take an example of nitrobenzene:
In Nitrobenzene, the resonance structures have positive charges around the ring system:
Every functional group shows its maximum effect on the ortho and para positions only as these two positons are in the plane of the ring unlike the meta position.
![](http://upload.wikimedia.org/wikipedia/commons/thumb/1/13/Nitrobenzene_resonance.svg/500px-Nitrobenzene_resonance.svg.png)
As we know that NO2 group is Electron withdrawing groups (EWG). It pulls the ring electrons towards itself. (See the Diagram).
Due to this pulling of electron; it decreases the electron density at ortho and para position of the ring (+ sign at o and p position). But, meta position remains unaffected during this movement of electron.
Answered by Ramandeep | 28 Oct, 2021, 14:34: PM
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