Determine the relationship between each of the pairs of the following compounds. Are they structural isomers (different molecules), conformational isomers (the same molecule), or not related?
(a)

Question

Determine the relationship between each of the pairs of the following compounds. Are they structural isomers (different molecules), conformational isomers (the same molecule), or not related?

(a)

Accepted Answer

Welcome back everyone. For the compounds below determine whether they are structural isomers, which means different molecules, confirmational isomers, which means the same molecule stereo isomers, which means same connectivity but different spatial arrangement of atoms or unrelated. So we have four possibilities and we are given two structures. The first thing that we want to do is basically identify the molecular formula for each structure. We noticed that the first structure has a total of five carbon atoms. And the second one also has a total of five carbon atoms. We can state that the first one will have a formula of C five and the second one will have a formula of C five. We simply want to count the number of hydrogen atoms. But we can see that those two structures are L canes and L knees have a general formula of C and H two N plus T. In this case, NS five. And we get two multiplied by five plus two, which is 12 implicit hydrogens. So that we don't need to count them. And if we have the same molecular formula, those structures cannot be unrelated. They also cannot be stereo isomers which is a concept applicable to structures that have wedges and dashes or basically chiral centers, right? And we don't see any bonds that are wedges or dashes, we are only given solid bonds. Now, the next possibility is to consider structural isomers and structural isomers would not be the case because not only they are different molecules but they have different connectivity of atoms. In this case, we can clearly see that we have a five member chain with no branching for each, for each structure. So they can only be conformational eye is immerse. Let's recall that confirmational isomers simply differ in the structure. By the way, how we perform bond rotation around the carbon carbon bond. We can clearly notice that the first structure simply has its bond rotated right. If we take the second structure, if we basically redraw that structure of normal pente, we can perform multiple bond rotations. And one of the bond rotations will specifically allow us to arrive at the confirmation of pens given to us in the first structure. And whenever we perform that free bond rotation, we can arrive at multiple different confirmations. Well, then, so we have our final answer. Those would be confirmational isomers. Thank you for watching.

Determine the relationship between each of the pairs of the following compounds. Are they structural isomers (different molecules), conformational isomers (the same molecule), or not related?
(a)

Verified video answer for a similar problem:

Key Concepts

Structural Isomers

Conformational Isomers

Isomerism

Determine the relationship between each of the pairs of the following compounds. Are they structural isomers (different molecules), conformational isomers (the same molecule), or not related?(a)

Verified video answer for a similar problem:

Key Concepts

Structural Isomers

Conformational Isomers

Isomerism

Determine the relationship between each of the pairs of the following compounds. Are they structural isomers (different molecules), conformational isomers (the same molecule), or not related?
(a)