Name each alkene. c.

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Identify the longest carbon chain that contains the double bond. This will be the parent chain and will determine the base name of the alkene.

Number the carbon atoms in the parent chain starting from the end closest to the double bond. This ensures that the double bond gets the lowest possible number.

Identify and name any substituents (alkyl groups or other functional groups) attached to the parent chain. Use the appropriate prefixes (e.g., methyl, ethyl) for these groups.

Combine the names of the substituents with the base name of the alkene. Place the substituents in alphabetical order, and use numbers to indicate their positions on the parent chain.

Indicate the position of the double bond by placing the number of the first carbon of the double bond before the base name of the alkene. For example, if the double bond starts at the second carbon, the name might include '2-ene'.

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Key Concepts

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

Alkenes

Alkenes are hydrocarbons that contain at least one carbon-carbon double bond (C=C). They are unsaturated compounds, meaning they have fewer hydrogen atoms than alkanes, which are saturated. The presence of the double bond gives alkenes unique chemical properties, including reactivity in addition reactions.

Nomenclature of Alkenes

The nomenclature of alkenes follows the IUPAC (International Union of Pure and Applied Chemistry) rules, which involve identifying the longest carbon chain containing the double bond. The name is derived from the number of carbon atoms in the chain, with the suffix '-ene' indicating the presence of a double bond. The position of the double bond is indicated by the lowest-numbered carbon atom involved in the bond.

Isomerism in Alkenes

Alkenes can exhibit geometric isomerism due to the restricted rotation around the carbon-carbon double bond. This results in cis and trans isomers, where substituents are positioned differently relative to the double bond. Understanding isomerism is crucial for naming alkenes correctly, as different isomers can have distinct physical and chemical properties.