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Stereochemistry is the study of the three-dimensional structures of compounds. In this chapter, we will discuss the various concepts in stereochemistry starting with some simple terms such as isomers.
What are isomers?
Isomers are compounds with the same molecular formula, but with different arrangements of atoms. Stereochemistry takes us further into the intricacies of isomerism in terms of three-dimensional perspectives. Furthermore, stereochemistry helps us understand the differences in activities of molecules that are structurally rather close. In many compounds, the slightest changes in the three-dimensional form of molecules make them active or inactive. This concept is especially important in many biologically significant molecules. Stereochemistry has taken us deep into the secrets of many naturally occurring molecules in our body.

Constitutional isomers have the same molecular formula but different arrangements. Look at the examples shown in Figure 19-1. They are constitutional isomers.

image\Ch 19 sec A.png


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