For each of the following fatty acids, give the shorthand notation for the number of carbon atoms and double bonds, and classify as saturated, monounsaturated, or polyunsaturated:
a. linoleic acid

Question

For each of the following fatty acids, give the shorthand notation for the number of carbon atoms and double bonds, and classify as saturated, monounsaturated, or polyunsaturated:

a. linoleic acid

Accepted Answer

Welcome back everyone for Arachidonic acid. What is the shorthand notation for this fatty acid that shows the number of carbon atoms and the double bonds. And number two, determine if the fatty acid is saturated or unsaturated mono or poly. So let's begin with the first part of this problem. And the information we need for this problem is simply the molecular formula of Arachidonic acid. It is C 20 32 ot we want to write a shorthand notation and essentially it consists of Brees and we have two numbers A and B A represents the number of carbon atoms and beer represents the double bonds, ignoring the double bond between carbon and oxygen. So we're only looking at the carbon carbon double bonds. We already know that the number of carbon atoms is 20 based on the molecular formula. So number A is 20 all that we have to do is identify B and to identify B, we're going to use the formula for hydrogen deficiency index, which is equal to one half multiplied by two, multiplied by the number of carbon atoms plus two minus the number of hydrogen atoms. So we're going to get one half multiplied by S two multiplied by 20 plus two minus 32 hydrogens. Let's perform the calculation 42 minus 32. This gives us 10 and 10 divided by two is equal to five. Now, we have to be very careful, we can remember that the hydrogen deficiency index can represent ranks and pi bonds. And of course, we know that those assets, they generally don't have ranks. So we can essentially immediately assume that those five would represent double bonds only. But how many carbon, carbon double bonds do we have? Well, we have to subtract one. And the reason why we're subtracting one is simply because it is an acid. And we know that acids, they have carbon oxygen double bond as we discussed. So we are subtracting that double bonds to get carbon carbon double bonds only. So number B is simply the hydrogen deficiency index minus one, which gives five minus one, which is simply four. So we have determined B which is four and we can essentially conclude that for the first part of the problem, the answer would be 22 4, 20 carbon atoms and four carbon carbon double bonds. That's our first answer. Now, let's continue with the second part of the problem where we want to determine if the fatty acid is saturated or unsaturated. First of all, let's conclude that it is unsaturated. The reason why it is unsaturated is simply because the number B is not zero it is four, we have nonzero number of carbon, carbon double bonds. And whenever we have a nonzero number of carbon, carbon double bonds, such an acid is called unsaturated. Now, is it mono or poli mono? Means that number B is equal to one. If B is greater than one, then it is a poly unsaturated acid. And that's it. We have determined the answers to this problem. Thank you for watching.

For each of the following fatty acids, give the shorthand notation for the number of carbon atoms and double bonds, and classify as saturated, monounsaturated, or polyunsaturated:
a. linoleic acid

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For each of the following fatty acids, give the shorthand notation for the number of carbon atoms and double bonds, and classify as saturated, monounsaturated, or polyunsaturated:a. linoleic acid

Verified video answer for a similar problem:

Key Concepts

Fatty Acid Structure

Saturation

Linoleic Acid

For each of the following fatty acids, give the shorthand notation for the number of carbon atoms and double bonds, and classify as saturated, monounsaturated, or polyunsaturated:
a. linoleic acid