Alkanes: The First 20 Members

This page provides a comprehensive list of the first 20 alkanes, showcasing their names and molecular formulas. Alkanes are a crucial class of hydrocarbons in organic chemistry, characterized by single bonds between carbon atoms.

The list begins with methane (CH₄) and progresses through increasingly complex molecules, ending with eicosane (C₂₀H₄₂). Each successive alkane adds one carbon atom and two hydrogen atoms to the previous molecule, following the general formula CnH₂n+₂.

Definition: Alkanes are saturated hydrocarbons with single bonds between carbon atoms, following the general formula CnH₂n+₂.

Highlight: The systematic naming of alkanes is based on the number of carbon atoms in their longest chain, with prefixes indicating the carbon count $e.g., meth- for 1, eth- for 2, prop- for 3, etc.$.

Example: Butane (C₄H₁₀) is the fourth alkane in the series, containing 4 carbon atoms and 10 hydrogen atoms.

The list includes:

1. Methane (CH₄)
2. Ethane (C₂H₆)
3. Propane (C₃H₈)
4. Butane (C₄H₁₀)
5. Pentane (C₅H₁₂)
6. Hexane (C₆H₁₄)
7. Heptane (C₇H₁₆)
8. Octane (C₈H₁₈)
9. Nonane (C₉H₂₀)
10. Decane (C₁₀H₂₂)
11. Undecane (C₁₁H₂₄)
12. Dodecane (C₁₂H₂₆)
13. Tridecane (C₁₃H₂₈)
14. Tetradecane (C₁₄H₃₀)
15. Pentadecane (C₁₅H₃₂)
16. Hexadecane (C₁₆H₃₄)
17. Heptadecane (C₁₇H₃₆)
18. Octadecane (C₁₈H₃₈)
19. Nonadecane (C₁₉H₄₀)
20. Eicosane (C₂₀H₄₂)

Vocabulary: The prefix "eicos-" in eicosane refers to twenty carbon atoms, derived from the Greek word for twenty.

This list is essential for students studying organic chemistry, as it forms the basis for understanding more complex hydrocarbon structures and their nomenclature. The systematic naming of alkanes and their structural formulas are fundamental concepts in organic chemistry, providing a foundation for exploring more complex organic compounds.