Existence of a molecule in more than one structure is called as Resonance.
None
of contributing structure is actual structure
but actual structure is the hybrid of all the structure.
Types of Resonance - (a) Pi-Bond resonance or Mesomeric effect
(b) sigma bond resonance or Hyper conjugation .
Condition - (a) Planer Molecule (b) Conjugation ........contd..
Note - Following video will be helpful for Understanding the concept of resonance
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