Following is the structural formula of a naturally occurring...

Following is the structural formula of a naturally occurring unsaturated fatty acid. \[ \mathrm{CH}_{3}\left(\mathrm{CH}_{2}\right)_{7} \mathrm{CH}=\mathrm{CH}\left(\mathrm{CH}_{2}\right)_{7} \mathrm{COOH} \] The cis stereoisomer is named oleic acid, and the trans isomer is named elaidic acid. Draw a line-angle formula of each acid, showing clearly the configuration of the carbon-carbon double bond in each.

Following is the structural formula of a naturally occurring unsaturated fatty acid.
\[
\mathrm{CH}_{3}\left(\mathrm{CH}_{2}\right)_{7} \mathrm{CH}=\mathrm{CH}\left(\mathrm{CH}_{2}\right)_{7} \mathrm{COOH}
\]
The cis stereoisomer is named oleic acid, and the trans isomer is named elaidic acid. Draw a line-angle formula of each acid, showing clearly the configuration of the carbon-carbon double bond in each.

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Key Concepts

Unsaturated Fatty Acids

Unsaturated fatty acids are organic compounds characterized by one or more double bonds in their hydrocarbon chains. These double bonds can introduce bends or kinks in the chain, which affects how the molecules pack together and influences their melting points as well as their interactions with other molecules. The presence of a carboxyl functional group at one end makes them acids.

Line-Angle Formula

A line-angle formula is a simplified way of drawing organic molecules where lines represent chemical bonds and vertices (where lines join) represent carbon atoms. Hydrogen atoms attached to carbons are usually omitted for clarity. This representation helps visualize the structure of molecules, particularly in complex organic compounds.

Cis-Trans Isomerism

Cis-trans isomerism, or geometric isomerism, arises in compounds with carbon-carbon double bonds due to restricted rotation. In cis isomers, similar or identical substituents are on the same side of the double bond, while in trans isomers, they are on opposite sides. This difference in spatial arrangement can significantly affect the physical and chemical properties of the molecules.

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