Because of the acidity of phenol, handling the compound can...

Name: Problem 90, Chapter 13: Chemistry for Today: General, Organic, and Biochemistry
Uploaded: 2021-07-22T08:12:01-08:00
Duration: 50 s
Channel: Alkendra Singh
Description: Because of the acidity of phenol, handling the compound can result in chemical burns. Using the idea of aromaticity (the electronic structure of benzene), explain why phenol is a stronger acid than cyclohexanol.

Because of the acidity of phenol, handling the compound can result in chemical burns. Using the idea of aromaticity (the electronic structure of benzene), explain why phenol is a stronger acid than cyclohexanol.

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Key Concepts

Aromaticity

Aromaticity refers to the exceptional stability observed in cyclic, planar molecules with a conjugated system of pi electrons that satisfy Huckel's rule. This delocalization of electrons over the ring structure results in a lower overall energy for the molecule, which significantly impacts its chemical behavior.

Resonance Stabilization

Resonance stabilization is the process by which the charge in a molecule is spread out or delocalized over several atoms through the presence of multiple valid Lewis structures. This delocalization reduces the electron density on any one atom, resulting in a more stable species.

Conjugate Base Stability

Conjugate base stability is a key factor in determining acid strength; a more stable conjugate base leads to a stronger acid. In aromatic systems like phenol, the negative charge of the conjugate base is delocalized over the aromatic ring, enhancing its stability compared to non-aromatic systems.

Acid Strength (pKa Concept)

Acid strength is often quantified by the pKa value, with lower pKa values indicating stronger acids. The stability of the conjugate base, through mechanisms like resonance and aromatic stabilization, directly influences an acid’s tendency to donate a proton, thereby affecting its acidity.

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