Question #87c17

1 Answer
Nov 2, 2017



It is not possible to have both. Constitutional isomers will have atoms that are attached in different orders (keep in mind that the chemical formula is still the same), whereas stereoisomers have same order of atom attachments, but just differ in how they arrange themselves in three-dimensional space.

Let's look at some examples:
As you can see, all three molecules above have 5 carbons (same chemical formula), but their attachment order is different. Therefore, these are constitutional isomers.

Stereoisomers are molecules that have the same molecular formula and differ only in how their atoms are arranged in three-dimensional space. Constitutional isomers also have the same molecular formula BUT differ in the way their atoms are connected, like the example above.

Below are two examples of stereoisomers:

As you can see, the only difference between the pairs above are how they arrange themselves in three-dimensional space. It is helpful to know that the word stereo means space and isomer is different structures. therefore, stereoisomers have different 3D arrangements, but they still have the same chemical formula.

And Lastly, here is a chart that you may find helpful:

Hope this helped (c: