Stereochemistry | Bsc 1st year |

Enantiomers: The pair of stereoisomers that are non – superimposable mirror images with each other. A non-superimposable mirror image is a necessary condition for the chirality of the molecule. similarly, chirality is the necessary condition for the molecule to show enantiomerism.

Characteristics of Enantiomers:

  1. They have identical physical and chemiscal properties.
  2. But, they show different actibvity towards plane polarised light and optically active reagent.
  3. The possible stereo isomers is given by 2n where n is the no of chiral centre or chiral carbon in the molecules.

Diastereomers: The pair of stereoisomers that do not mirror images of each other are called diastereomers

Characteristics of Diastereomers :

  1. They have similar chemical properties but different physical properties. i.e melting, boiling point, refractive index, solubility, density etc.
  2. They may or may not be optically active.
  3. They can be separated from one another due to the different in their physical properties.

From the above figure, I and III, II and IV, I and IV, and II and IV are diastereomers.

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