Sunday, May 15, 2011

Resonance


    When a single structure is unable to explain all the properties of a compound, a number of other structures are suggested to that substance but none of them is able to explain all the properties of the compound completely. The different structures have no real existence and are called Contributing, Canonical or Resonating Structures. This phenomenon is known as Resonance. The resonating structures are separated from each other by double headed arrows (↔).The actual structure known as Resonance Hybrid lies in between the resonating structure and explains all the properties of the compound.
Due to resonance, molecule gains stability or in other words, energy of the molecule is decreased. The amount of energy decreased due to resonance is known as Resonance Energy.

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