This document discusses the different types of isomerism. It begins by explaining that isomerism was first observed in 1827 and the term was introduced in 1830. There are two main types of isomerism: structural isomerism, which is due to differences in atomic arrangement within a molecule, and stereoisomerism, which have the same molecular and structural formulas but differ in atomic arrangement in space. Some examples of structural isomers are chain, position, functional, metamerism, and tautomerism. Examples of stereoisomers discussed are cis-trans isomers and enantiomers.

1. In The Name Of ALLAH,
The Most Beneficent and Merciful.

3. Isomerism was first noticed in
1827 ,when Friedrich Wohler
prepared silver cyanate .
Jones Jakob Berzelius introduced
the term isomerism in 1830 .

4. An Isomer is a Greek word ; Isos means ‘Same’
and Meros means ‘Parts’.
‘Compounds Having same Molecular
Formula but Different Structural
Formula are called as isomers and
This phenomenon is called as
Isomerism.’

6. There are Two main Types :
 STRUCTURAL ISOMERISM
STEREIO ISOMERISM

7. ‘ When the Isomerism is due to the
difference in the arrangement of
atoms within the molecule this
phenomenon is called as Structural
isomerism.’

9. There are Five Types :
 Chain Isomerism
 Position Isomerism
 Functional Isomerism
 Metamerism
 Tautomerism

10. Stereio Isomerism
‘Isomerism which have same
molecular formula and same
structural formula but differ in the
manner their atoms are arranged .’

12.  Cis trans isomers
 Enantiomers

13. ‘Such compounds having same
structural formula but differs with
respect to the position of identical
groups in space are called cis trans
isomers and phenomenon is called
as cis trans isomerism.’

15. The stereoisomers which are
related to each other and
are mirror image of each
other are called as
Enentiomers.