Name each alkane.
a. CH₃-CH₂-CH₂-CH₂-CH₃
b.

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Identify the longest continuous carbon chain in the alkane structure. This will determine the base name of the alkane according to the number of carbon atoms.

Number the carbon atoms in the longest chain starting from the end nearest a substituent, if any. This helps in assigning the lowest possible numbers to the substituents.

Identify and name any alkyl groups (substituents) attached to the main carbon chain. Use prefixes like methyl, ethyl, propyl, etc., based on the number of carbons in the substituent.

Assign a number to each substituent based on its position on the main chain. If there are multiple identical substituents, use prefixes like di-, tri-, tetra-, etc.

Combine the names of the substituents with the base name of the alkane, placing the substituents in alphabetical order and using hyphens to separate numbers from words.

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Alkanes

Alkanes are a class of hydrocarbons characterized by single bonds between carbon atoms, following the general formula CnH2n+2. They are saturated compounds, meaning they contain the maximum number of hydrogen atoms per carbon atom. Alkanes can be straight-chain or branched, and their names are derived from the number of carbon atoms they contain, such as methane (1 carbon), ethane (2 carbons), and propane (3 carbons).

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01:20

Naming Alkanes Example

Nomenclature

Nomenclature in organic chemistry refers to the systematic naming of chemical compounds. For alkanes, the International Union of Pure and Applied Chemistry (IUPAC) provides rules for naming based on the number of carbon atoms and the structure of the molecule. The names typically end with the suffix '-ane' to indicate that they are alkanes, and prefixes like 'meth-', 'eth-', 'prop-', etc., denote the number of carbons.

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02:39

Rules for Naming Alkanes

Isomerism

Isomerism is the phenomenon where compounds with the same molecular formula exhibit different structural arrangements. In alkanes, structural isomers can occur when carbon atoms are arranged in different ways, leading to distinct compounds with unique properties. For example, butane (C4H10) has two isomers: n-butane (a straight chain) and isobutane (a branched chain), which have different boiling points and chemical behaviors.

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