What is the difference in the location of the first double bond in an omega-3 and an omega-6 fatty acid (see Chemistry Link to Health “Omega-3 Fatty Acids in Fish Oils”)?

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Hi, everyone. And welcome back. Our next problem says which statements are true about Omega three and Omega six fatty acids in relation to their double bond placement and functional differences. So let's look at our four statements they're given that are could be either true or false statement. One Omega three fatty acids have the first double bond located at three carbons from the omega end of the fatty acid chain. Number two, Omega three fatty acids have the first double bond located in three carbons from the carbonel group on the fatty acid chain state. Number three, Omega three fatty acids are commonly found in dietary sources such as fish oil and flax seeds. And finally, statement four Omega six fatty acids have their first double bond located six carbons from the carbon group of the fatty acid chain. And our answer choices are a one and three B, two and three, C 13 and four or D 23 and four. So let's look at these statements and evaluate them. So, statement, one Omega three fatty acids have their first double bond located at three carbons from the omega end of the fatty acid chain. And this is a true statement. So number one has to be included in our answers. So we can go ahead and eliminate choice B which just has two and three and choice D which has 23 and four. So just a little important note, when you're on a test, you might use that elimination to see, you know, do I have an answer? Am I just ready to go on even without evaluating all my statements? But this is a practice problem. So we'll be going through all of them. Anyway, number two, Omega three fatty acids have the first double bond located in three carbons from the carbonyl group of the fatty acid chain. And that is incorrect. As we saw in statement one, it's three carbons from the Omega m. So not on the end with the carboxylic acid. So a statement two is incorrect. That doesn't rule either choice out. So let's keep going. Statement. Three Omega three fatty acids are commonly found in dietary sources such as fish oil and flax seeds. Well, this is a true statement. So statement three is true as well as statement one. However, we still have two answer choices that have statement three in them. So we need to look on at statement four Omega six fatty acids have their first double bond located six carbons from the carbon group of the fatty acid chain. And again, we see like in statement two, this has the wrong end. This should be the omega end of the fatty acid chain. So statement four is incorrect. So we can rule out choice C 13 and four. And our answer is therefore choice A one and three. So our true statements here about Omega three and Omega six fatty acids in relation to their double bond placement and functional differences is choice a one and three. See you in the next video.

What is the difference in the location of the first double bond in an omega-3 and an omega-6 fatty acid (see Chemistry Link to Health “Omega-3 Fatty Acids in Fish Oils”)?

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Key Concepts

Omega-3 Fatty Acids

Omega-6 Fatty Acids

Fatty Acid Structure