Constitutional Isomers vs. Stereoisomers

Isomers are terms used to describe relationships between similar molecules.

If you are confused by how to solve for IHD, refer to my Index of Hydrogen Deficiency topic. 

*These are also known as structural isomers

Concept: Determining when molecules are stereoisomers.

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Heads up: The terms enantiomers, diastereomers, and meso compounds are all used to describe specific types of stereoisomers- we’ll get to those later in this chapter.  

Concept: Determining when molecules are conformers.

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Since conformers are simply rotations along single bonds, these would also count as identical molecules; they can easily twist back into position with each other.