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Unformatted text preview: This added stability is called resonance energy. The more nearly equal in stability the contributing structures, the greater the resonance energy. For example, the allyl cation is particularly stable because it has two equivalent resonance structures. 7) The more stable a resonance structure is, the more it contributes to the resonance hybrid. The structure on the left is a tertiary carbocation and is more stable than the resonance structure on the right which is a primary carbocation. 6. ESTIMATING RELATIVE STABILITY OF RESONANCE STRUCTURES 1) Resonance structures with more covalent bonds are more stable. 2) Separation of charge decreases stability. The structure on the left is more stable because there is no separation of charge. 3) Resonance structures in which all atoms have completely filled valence shells are particularly stable. The structure on the right above is more stable....
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