How are the following pairs of carbohydrates, shown in a Fischer projection, related to each other? Are they structural isomers, enantiomers, diastereomers, or epimers?
(a)

Question

How are the following pairs of carbohydrates, shown in a Fischer projection, related to each other? Are they structural isomers, enantiomers, diastereomers, or epimers?

(a) Fischer projections of two carbohydrate structures for comparison of their relationships.

Accepted Answer

Welcome back. Everyone are Sorbo and Idose structural isomers in Antium diastema or epimer. First of all, what we want to do is simply draw the two structures and we're going to begin with sobs. And we essentially want to understand that it is a ketos. It begins with C H2O H we can throw the fish projection. The next carbon represents carbo and hence it is a keto, right? Because we have a ketone, then we're going to add hydrogen on the left for carbon number three hydroxyl on the right. For the next carbon, we simply want to swap these. And now hydroxyl is on the left, hygiene is on the right. And then once again, while we have an additional chiral position with hydroxyl on the right hydrogen on the left, followed by C H2O H for the next structure we have IOS. And now, first of all, what we understand is that it contains carbonel, but in this case, that's an alde height. So we have an aldose cho followed by a chiral position hydroxy group and hydrogen, another chiral position hydroxy group and hydrogen, the third carol position hydroxy group and hydrogen. And then we have an additional chal position hydrogen and hydroxy group followed by C H2O. So in such a problem, we first of all want to make sure that we have the same molecular formula for each compound. How many carbons do we have? 12345 and six carbons for sorbets for I do 12345 and six. So, six carbons for each. What about hydrogens? We have 123456789, 1011, 12, right? So 12 hydrogens and how many oxygens or sorbets? That'd be 12345 and six. And now for I do, how many oxygens do we have? 12345 and six? What about hydrogens? 123456789, 1011, 12? So they have the same molecular formula and we can begin by checking if they are structural isomers, which means that they have the same molecular formula but different connectivity of atoms. And indeed, they must be structural isomers because as we can see in one of our positions, we have a double bonded carbon forming a ketone functional group. And in idose, well, essentially we have an aldehyde right. So they contain different functional groups which implies different connectivity of atoms. And therefore, we can conclude that they are structural isomers because they have the same molecular formula. But different connectivity of atoms, we have determined that by the presence of different functional groups. Thank you for watching.

How are the following pairs of carbohydrates, shown in a Fischer projection, related to each other? Are they structural isomers, enantiomers, diastereomers, or epimers?
(a)

Verified video answer for a similar problem:

Key Concepts

Structural Isomers

Stereoisomers

Epimers

How are the following pairs of carbohydrates, shown in a Fischer projection, related to each other? Are they structural isomers, enantiomers, diastereomers, or epimers?(a)

Verified video answer for a similar problem:

Key Concepts

Structural Isomers

Stereoisomers

Epimers

How are the following pairs of carbohydrates, shown in a Fischer projection, related to each other? Are they structural isomers, enantiomers, diastereomers, or epimers?
(a)