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Mesomeric or Resonance effect -
Migration of lone pair or
electron in a conjugated system.
- wherein
It is a permanent effect
Stability due to resonance -
More the no of resonating structure more is the stability.
- wherein
Hyperconjugation or σ-π resonance or Baker and Nathan effect -
The conjugation between
sigma bond and adjacent multiple bond or carbocation is called Hyperconjugation.
- wherein
It is permanent effect.
Application of Hyperconjugation -
More is the no of Hyperconjugation structure more is the stability of carbocation
- wherein
(a)
(b)
(c)
(d)
Option 1)
Option 2)
Option 3)
Option 4)