What is Professor Blake's favorite molecule?

Question

BlackTom AI · Accepted Answer

Aromaticity and resonance stabilization make benzene uniquely notable among small molecules, so Benzene is the correct choice.

1. Relevant knowledge points and concepts
- Aromaticity: planar, cyclic, conjugated systems with (4n + 2) π electrons are unusually stable (Hückel’s rule).
- Resonance and delocalization: benzene’s six π electrons are delocalized around the ring, giving equal bond character (bond order ≈1.5) and extra stabilization called resonance energy.
- Chemical behavior: benzene undergoes electrophilic aromatic substitution rather than addition, preserving the aromatic system.
- Practical and historical importance: benzene is a central scaffold in organic chemistry, materials, and pharmaceuticals.

2. Step-by-step reasoning
- Examine each option for special features that would make it a “favorite” for a chemist:
  a) Methane (CH4): simplest alkane, tetrahedral, no π system, limited conceptual richness for advanced organic chemistry.
  b) Ethane (C2H6): simple sigma-bonded alkane, rotamers are interesting but lacks conjugation/aromaticity.
  c) Benzene (C6H6): cyclic, planar, conjugated. Count π electrons: 6 π electrons.
  d) CFC-12 (CCl2F2): chlorofluorocarbon known for ozone depletion; not celebrated by chemists for elegance.
  e) Chloroform (CHCl3): historically important as anesthetic, but toxic and not aromatic.

3. Intermediate calculation (Hückel’s rule)
- Hückel’s rule: 4n + 2 = number of π electrons for aromaticity.
- For benzene: 4n + 2 = 6 → n = 1 (integer), so benzene is aromatic and thus especially stable and conceptually rich.

4. Why the correct answer is correct
Benzene’s combination of symmetry, equalized bond lengths (bond order ≈1.5), resonance stabilization, distinctive reactivity pattern, and foundational role in organic chemistry make it a natural “favorite” molecule for a professor interested in core chemical principles.

5. Why other options are incorrect (brief)
- Methane and ethane: simple alkanes without π-conjugation or aromaticity.
- CFC-12: environmentally harmful, not a paradigmatic molecule of chemical elegance.
- Chloroform: not aromatic and is primarily notable for toxicity/medical history.

Conclusion: Based on aromaticity, resonance stabilization, and the distinctive chemical and conceptual importance of benzene, the correct answer is Benzene, matching the provided answer.

What is Professor Blake's favorite molecule?单项选择题

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