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Stereochemistry: It is a branch of chemistry which deals with the 3 dimensional arrangements of different atoms of a molecule with respect to each other in a space around it.
Configuration of an organic molecule represents an exact 3D arrangement of all the atom in a molecule with respect to each other.
e.g. consider a molecule of methane with molecular formula CH4. Its 2D and 3D configurations are
Conformation: Conformation can be discussed only for those organic molecules which posses at least two carbon atom is directly attached with each other. e. G. Consider a molecule of ethane C2H6. It has been observed that the entire molecule of ethane can undergo different structural arrangements / changes just by single bond rotation.
Different structural arrangement obtained as a result of free rotation around C -C single bond are treated as the conformation of that molecule, more over the relative study of stability of different conformation possible for same molecule is known as conformational analysis.
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