need for Bsc Students

1. Online Class for B. Sc I Year Students
Stereochemistry
Class- B.sc – I (SEM-I) Paper- II
Topic- Stereochemistry
Presented By-
Dr. Ganesh D. Satpute
Department of Chemistry

2. Isomers

3. Isomers – Two or more molecules
have same molecular formula but
different structural formula.
Types
I) Structural Isomerism
II) Sterioisomerism

4. Structural Isomerism
• When two or more molecules have same
molecular formula but different structures, it is
called as Structural Isomerism
Types-
1. Chain isomerism
2. Position isomerism
3. Functional isomerism
4. Ring-chain isomerism
5. Tautomerism isomerism

5. Chain isomerism
• When two or more molecules have same
molecular formula but Difference in the
carbon chain in the molecule
Molecular formula:- C5H12

6. Position isomerism
When two or more molecules have same
molecular formula but Difference in the position
of multiple bond or substituents
Molecular formula:- C4H8
CH2 CH CH2 CH3 CH3 CH CH CH3
1-butene 2-butene

7. Ring-chain isomerism
When two or more molecules have same
molecular formula but one is open chain while
the other is ring structure
Molecular formula:- C4H8
CH2 C CH3
CH3
CH2
CH2
CH2
CH2
2-methylpropene cyclobutane

8. Functional isomerism
When two or more molecules have same
molecular formula but Difference in the
functional groups present in the isomers
Molecular formula:- C3H6O
O
C C C
H
H
H
H
H
H
aldehyde
H
C C C
H
H
H
H
O
H
ketone

9. Tautomerism isomerism
When two or more molecules have same
molecular formula but Difference in the
functional groups and they are in dynamic
equilibrium with each other
Molecular formula:- C3H6O

10. Stereoisomerism
When two or more molecules have same
molecular formula but Different relative
arrangements of substituent atoms or groups in
the space
Types:-
1. Optical isomerism
2. Geometrical isomerism
3. Conformational isomerism

11. Optical isomerism
The compound with similar physical & chemical
properties, due to structural similarity but differ
in their action on plane polarized light are called
as optical isomers.