Draw structures for molecules that fit the following descriptions:
(c) C₃H₆O₂ containing a carboxylic acid functional group

Question

Draw structures for molecules that fit the following descriptions:

(c) C₃H₆O₂ containing a carboxylic acid functional group

Accepted Answer

Hi, everyone. Our next problem says, propose a structure for a compound that has a chemical formula of C two H 402 and a carboxylic acid. We have four possible structures labeled A through D. So let's look through these and see which one could possibly be our structure. Now, we could start with our formula and our knowledge of our functional group and figure out what the possible structures are. But it's a little better on a multiple choice question to look at our choices and see if we can eliminate possibilities. First makes it a little quicker. So first, let's think about the structure of this functional group. And carboxylic acid, we have a carbon double bonded to an oxygen and then also single bonded to an alcohol group. So it's something's written coo H So first, let's make sure that our answer choices have this functional group, we can eliminate any that do not. So in choice, a our functional group is not a carboxylic acid because the, instead of it being a single bond to an oh group, we have another chain coming off the O. So our functional group instead here is our coo R instead of coo H. So this group is an ester, not a carboxylic acid. When we look at our other answer, choices, we see that choice D also has an ester instead of a carboxylic acid. So A and D have the wrong functional group. And then when we look at choice B, we see that we have an aldehyde rather than a carboxylic acid because our carbon has a bond to a hydrogen rather than an a, an alcohol group. Choice B also incorrect. So there we go, we don't even have to look at what the structure is because we've eliminated three out of four choices by elimination. Our answer choice must be choice C. And if we want to double check, we see we do have our carboxylic acid properly. Now, if we look at our formula here, we have C two H 402. Well, our carboxylic acid we know has one carbon, two oxygens and a hydrogen. So if I subtract co2 H I have left over one carbon and three hydrogens, I have essentially a methyl group which we see I have on my structure C attached to the carboxylic acid. So choice C is indeed our only possible structure for a chemical formula of C two H 402 containing the carboxylic acid. See you in the next video.

Draw structures for molecules that fit the following descriptions:
(c) C₃H₆O₂ containing a carboxylic acid functional group

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Key Concepts

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Draw structures for molecules that fit the following descriptions:
(c) C₃H₆O₂ containing a carboxylic acid functional group