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Modify the following fatty acid so that it represents the 18-carbon fatty acid designated 18:2(?9,12). Draw...

Modify the following fatty acid so that it represents the 18-carbon fatty acid designated 18:2(?9,12). Draw any double bonds in the cis configuration.
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Concepts and reason

Fatty acids are long chain aliphatic hydrocarbons with carboxylic acid functional group. They can be classified into saturated or unsaturated fatty acids. The carbon chain in fatty acids starts from 5 carbons to 22 carbon atoms.

Fundamentals

Saturated fatty acid: The long chain hydrocarbon contains only single bond. There is no double or triple bonds present in the structure.

Unsaturated fatty acid: The long chain hydrocarbon contains double and triple bonds.

The fatty acid (long chain hydrocarbon) can be represented in a ratio format.

Example: 15:3

The ratio 15:3 represents that the fatty acid should contain total number of 15 carbons and 3 represents the structure that contain 3 double bonds.

The carbon skeleton is drawn below.

15
11
1
.COOH
13
17
7
3
18
4
14
10
12
2
16

Fatty acid:

1
COOH
7
15
17
10
14
4
18
16
2
11
13
12

Ans:

.COOH

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