Chapter 14. Theoretical Foundations of Organic Chemistry
10 topics with brief reviews: definitions, key facts, and class questions.
This chapter lays the foundation for understanding bioorganic chemistry. Here, we analyze the basic principles: from the spatial structure of molecules and general properties of organic compounds to strict classification and nomenclature rules. Without these fundamentals, it is impossible to understand how metabolites and drugs work in the human body.
The section covers key concepts that determine the chemical behavior of substances. We examine homologous series, types of isomerism, energetically favorable conformations, and the main types of organic reactions in detail.
In practical classes and colloquia, instructors most frequently test the knowledge of systematic nomenclature and the understanding of stereoisomerism. You will certainly be required to demonstrate the ability to draw conformations (e.g., Newman projections or cyclohexane conformations) and determine chemical reaction mechanisms. The materials in this section will help you organize the theory and answer confidently at the blackboard.
Why are methane and chloroform classified as organics if they lack a C–C bond?
In cases where the C–C bond is absent, the classification depends on traditions and the properties of the specific substance. Methane ($CH_4$), chloroform ($CHCl_3$), and formic acid are historically and by their chemical properties classified as organic compounds.
Their molecules have a branched structure and a relatively large molecular weight (up to 900), which impedes their free movement relative to each other.
Their molecules have a branched structure and a relatively large molecular weight (up to 900), which impedes their free movement relative to each other.
In which cases is carbon divalent?
Carbon exhibits a valence of (II) exclusively in carbenes. These are extremely unstable reaction intermediates (biradicals) that exist for a fraction of a second.
What serves as the axis for internal rotation in molecules?
In polyatomic organic compounds, the carbon-carbon single bond (C–C) serves as the axis for the continuous free rotation of atomic groups.
What is the difference between homologs and isomers?
Homologs have a similar structure but a different number of carbon atoms (differing by a methylene group). Isomers, on the other hand, have the exact same quantitative composition of the molecule, but fundamentally different structural arrangements.
Do all organic substances have isomers?
No, not all. The simplest hydrocarbons (methane, ethane, propane, ethylene, acetylene), as well as formaldehyde, methanol, and formic acid, do not form isomers.
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