Which of the following is NOT described by a fatty acid designated C18:3 n-3?

Question

BlackTom AI · Accepted Answer

Let’s break down what C18:3 n-3 means and evaluate each statement against that definition.
Option 1: It has 18 carbons in the carbon chain. This is true for C18:3 n-3, since the prefix 18 indicates an 18-carbon fatty acid backbone. So this option accurately describes the molecule.
Option 2: It has only 1 double bond located at the third carbon from the omega side. This is not consistent with C18:3 n-3. The designation 3 indicates there are three double bonds in the chain, not one, and the n-3 position means the first double bond is three carbons away from the omega end, not described here as a single bond at a specific third carbon. Therefore, this statement mischaracterizes the structure and is not describing C18:3 n-3.
Option 3: It is linolenic acid. This is true: linolenic acid is commonly used to refer to 18:3 n-3, so this option correctly describes the fatty acid.
Option 4: It has 3 double bonds in total. This is also true for C18:3 n-3, which by definition contains three double bonds along the 18-carbon chain.
In summary, the only statement that mismatches the characteristics of C18:3 n-3 is Option 2, because it asserts a single double bond at a specific position, whereas the designation specifies three double bonds and the omega-3 positioning instead of a solitary bond at that location.

Which of the following is NOT described by a fatty acid designated C18:3 n-3?单项选择题

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