What are the IUPAC names of the following alkanes?
a.

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Identify the longest continuous carbon chain in each structure. This chain determines the base name of the alkane (e.g., methane, ethane, propane, etc.).

Number the carbon atoms in the longest chain, starting from the end nearest to the first substituent group. This ensures the substituents have the lowest possible numbers.

Identify and name all substituent groups attached to the main chain. Substituents are named based on the number of carbons they contain (e.g., methyl for CH₃, ethyl for C₂H₅).

Combine the names of the substituents with the base name of the alkane. Use prefixes (di-, tri-, etc.) if there are multiple identical substituents, and list substituents in alphabetical order.

Write the full IUPAC name by placing the substituent names (with their position numbers) before the base name of the alkane. Use hyphens to separate numbers from words and commas to separate multiple numbers.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

IUPAC Nomenclature

IUPAC nomenclature is a systematic method for naming chemical compounds, particularly organic molecules. It provides a set of rules to create unique names based on the structure of the compound, ensuring that each name conveys specific information about the molecule's composition and arrangement. Understanding these rules is essential for accurately identifying and communicating about alkanes and other organic compounds.

Alkanes

Alkanes are a class of hydrocarbons characterized by single bonds between carbon atoms and a general formula of CnH2n+2. They are saturated compounds, meaning they contain the maximum number of hydrogen atoms possible for a given number of carbon atoms. Recognizing the structure and properties of alkanes is crucial for determining their IUPAC names.

Structural Isomers

Structural isomers are compounds that have the same molecular formula but different structural arrangements of atoms. In the context of alkanes, this means that multiple alkanes can share the same formula while differing in their connectivity, leading to different IUPAC names. Understanding structural isomerism is important for accurately naming and distinguishing between various alkanes.

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Related Practice

Textbook Question

Draw both condensed and line structures corresponding to the following IUPAC names and label each carbon as primary, secondary, tertiary, or quaternary.

c. 2,2,4-Trimethylpentane

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Are the pairs of compounds shown below the same molecule, isomers, or different molecules?

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Write the structures of all singly chlorinated products that form when 2,4-dimethylpentane is reacted with Cl₂.

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Convert the following line structures to condensed structures:

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Draw and name alkanes that meet the following descriptions:

a. A 5-carbon alkane with a tertiary carbon atom

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