뒤로Chemical Reactions and Organic Chemistry: Structure and Function of Biological Molecules
스터디 가이드 - 스마트 노트
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Organic Compounds
Introduction to Organic Compounds
Organic compounds are molecules that contain carbon and are fundamental to all living organisms. Carbon's unique ability to form large and diverse molecules underpins the complexity of biological systems.
Key Biological Molecules:
Carbohydrates
Lipids
Proteins
Nucleic acids
Carbon's Electron Configuration: Carbon has four electrons in its outer shell and forms four covalent bonds to achieve a stable octet.
Example: Methane (CH4) demonstrates carbon's tetrahedral bonding structure.
Hydrocarbons and Carbon Skeletons
Hydrocarbons are organic compounds composed only of carbon and hydrogen. The arrangement of carbon atoms forms the molecule's carbon skeleton, which can be branched or unbranched.
Unbranched Skeleton: Example is butane.
Branched Skeleton: Example is isobutane.
Isomers: Molecules with the same chemical formula but different connectivity. Isomers have distinct chemical properties due to their shapes.
Functional Groups
Role and Properties of Functional Groups
Functional groups are specific groups of atoms attached to organic molecules that determine their chemical reactivity and unique properties. Many functional groups are polar, making molecules hydrophilic and water-soluble.
Polarity: Oxygen or nitrogen in functional groups creates strong electron pull, increasing polarity.
Hydrophilicity: Polar groups interact well with water, aiding solubility.
Biological Importance: Functional groups are essential for molecular interactions in biological systems.
Functional Group | Structure | Example | Properties |
|---|---|---|---|
Hydroxyl | -OH | Ethanol | Polar, forms alcohols |
Carbonyl | -C=O | Aldehyde, Ketone | Polar, found in sugars |
Carboxyl | -COOH | Carboxylic acid | Acidic, ionizes in solution |
Amino | -NH2 | Amines | Basic, found in amino acids |
Phosphate | -PO4 | Organic phosphates | Energy transfer (ATP) |
Methyl | -CH3 | Methylated compounds | Non-polar, affects shape |
Specific Functional Groups
Methyl Group: Non-polar, non-reactive, but influences molecular shape and function.
Hydroxyl Group: Composed of a hydrogen atom bonded to an oxygen atom, which is then bonded to a carbon skeleton. Groups containing hydroxyl are called alcohols. Example: Ethanol.
Carbonyl Group: Carbon atom double-bonded to oxygen. If at the end of a chain, it's an aldehyde; if in the middle, it's a ketone. Example: Sugars contain carbonyl and hydroxyl groups.
Carboxyl Group: Carbon double-bonded to oxygen and single-bonded to a hydroxyl group. Behaves as an acid, ionizing and donating H+ to solution. Example: Carboxylic acids.
*Additional info: Functional groups are critical in determining the solubility, reactivity, and biological roles of organic molecules. Their presence and arrangement influence molecular interactions, enzyme activity, and cellular processes.*
