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Mesomeric Effect (Resonance Effect)
+ M Effect (+ R) and – M Effect (- R)
(+M effect of y)
(-M effect of NO2)
Mesomeric Effect in Phenol (+ M Effect)
Mesomeric Effect in Aniline (+ M effect)
- M effect in Benzaldehyde
Ex. Identify the compound showing +M or –M separately
Sol. (a) (-M) (b) (-M) (c) +M
* +M group increases electron density of ring while –M decreases the electron density of benzene ring.
If NO2 is present on the ortho or para position then along with it’s –I effect, it will also show –M effect.
Above compound have +M of -OH and –M of NO2 group.
As we can easily see that –NO2 at Meta position is not attracting e-density towards itself and that’s why it will not show –M effect at meta-position.
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