Which of the following is not true for monocyclic aromatic compounds The T-system may contain 2, 6 or 10 electrons The ring is planar O The ring may contain heteroatoms The T-system may contain 4 or 8 electrons
Which of the following is not true for monocyclic aromatic compounds The T-system may contain 2, 6 or 10 electrons The ring is planar O The ring may contain heteroatoms The T-system may contain 4 or 8 electrons
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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Transcribed Image Text:**Question:**
Which of the following is **not** true for monocyclic aromatic compounds?
- The π-system may contain 2, 6, or 10 electrons
- The ring is planar
- The ring may contain heteroatoms
- The π-system may contain 4 or 8 electrons
**Explanation:**
Monocyclic aromatic compounds exhibit specific characteristics that align with Huckel's rule for aromaticity, which states that the compound must have a π-system containing 4n + 2 electrons (where n is a non-negative integer). This means that 2, 6, and 10 electrons in the π-system are typical for aromatic compounds. Additionally, for a compound to be aromatic, the ring must be planar to allow for effective overlap of the p orbitals.
Aromatic rings can also include heteroatoms, such as nitrogen, oxygen, or sulfur, which contribute to the aromaticity as long as they do not disrupt the electron count necessary for aromaticity.
However, a π-system containing 4 or 8 electrons does not satisfy Huckel's rule and therefore cannot be aromatic, making the final option incorrect for monocyclic aromatic compounds.
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