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Stereoisomers

 

  • Two molecules with the same molecular formula but different structural formula are called isomers. Due to different structural formulas of isomers, they show different chemical and  physical properties.  

 

  • Isomers can be classified as structural isomers and stereoisomers. This classification is on the basis of arrangement of bonded atoms in the 2D and 3D space around the central atom. 

 

  • The structural isomers have the same molecular formula but different arrangement of bonded atoms. Thus, two structural isomers must exhibit different chemical and physical properties. 

 

  • Structural isomerism can be further classified as: Chain isomerism, functional group isomerism, metamerism, tautomerism and position isomerism. 

 

  • Substances having the same molecular formula and same structural formula but differ in the spatial arrangement of atoms or groups of atoms are known as stereoisomers.

 

  • Enantiomers: Stereoisomers which are non-superimposable mirror images of each other are called enantiomers. They are classified as ‘d’ and ‘l’ isomers. 

 

  • Diastereomers: The optical isomers which are neither mirror image non-superimposable to each other are called diastereomers.
     


Stereoisomers Questions

 

Question 1: Stereoisomers are the Substances having the same molecular formula and same structural     formula but differ in the ___________ of atoms.

(a) Bonds

(b) Spatial arrangement

(c) Molecular formula

(d) Masses

Solution : Substances having the same molecular formula and same    structural formula but differ in the spatial arrangement of atoms.

Answer : (b)

 

Question  2: Stereoisomers which are non-superimposable mirror images of each other are called ___________.

(a) Diastereoisomers

(b) Racemic mixtures

(c) Enantiomers

(d) All the above

Solution : Stereoisomers which are non-superimposable mirror images of each other are called enantiomers.

Answer : (c)
 

Question  3: The optical isomers which are neither mirror image nor superimposable to each other are called ____________. 

(a) Diastereoisomers

(b) Racemic mixtures

(c) Enantiomers

(d) All the above

Solution : The optical isomers which are neither mirror image nor superimposable to each other are called diastereomers.

Answer : (a)

 

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