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When will resonance be possible in a molecule?
Resonance is the movement of electrons from one bond to another. This helps to shift the electron distribution between multiple atoms, creating molecular stability. In order for resonance to occur, there must be a pi bond next to a sigma bond. A pi bond is a double bond or triple bond and a sigma bond is a single bond. During resonance, the electrons from the pi bond move around causing the double (or triple) bond to shift positions. This frequently occurs with oxygen and nitrogen because they have several valence electrons and can readily form pi bonds, but these elements are not required to form resonance structures.
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Which of the following best explains the concept of resonance structures?
Resonance structures are a way of describing the different possible locations of delocalized electrons within a molecule. Although a molecule might have several correct resonance forms, often, one is more stable than the others. Molecules whose structures differ in the locations of atoms are called isomers.
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