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MCAT Chemical and Physical Foundations of Biological Systems Flashcards: 5d Aromatic Heterocyclic Compounds

Study 5d Aromatic Heterocyclic Compounds in MCAT Chemical and Physical Foundations of Biological Systems with focused flashcards that help you recognize the idea, recall the key rule, and apply it in practice-style prompts.

QUESTION

What is the aromaticity of furan, and which electrons complete its aromatic sextet?

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ANSWER

Aromatic; one O lone pair contributes to make 66  electrons. Furan's aromaticity in its five-membered ring relies on oxygen's lone pair contributing to the π system for Hückel compliance.

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MCAT Chemical and Physical Foundations of Biological Systems: Foundational Concepts

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This deck focuses on 5d Aromatic Heterocyclic Compounds, giving you a quick way to review the definitions, rules, and examples that matter most for MCAT Chemical and Physical Foundations of Biological Systems.

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Work through these flashcards in short sessions. Try to answer each prompt before flipping the card, then revisit any cards you miss until the explanation feels automatic.

Practice questions

1 of 50Practice questions for this set
A synthetic intermediate contains a substituted thiophene intended for selective bromination. The substrate is 2-methylthiophene treated with \ceBr2\ce{Br2} (no radical initiator) at mild conditions favoring EAS. The central concept is regioselectivity via σ-complex resonance stabilization in five-membered heteroaromatics: α-attack (at C2/C5) typically yields more resonance-stabilized intermediates than β-attack (at C3/C4). Which product is most likely? Numbering: thiophene S is position 1; adjacent carbons are 2 and 5; remaining are 3 and 4. A methyl is at C2.
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