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Lecture 2

The document discusses structural isomerism in organic compounds, where isomers share the same molecular formula but differ in their structural formulas. It outlines five types of structural isomerism: chain, position, functional, metamerism, and tautomerism, providing examples for each. References for further reading are also included, highlighting key textbooks in organic chemistry.

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26 views3 pages

Lecture 2

The document discusses structural isomerism in organic compounds, where isomers share the same molecular formula but differ in their structural formulas. It outlines five types of structural isomerism: chain, position, functional, metamerism, and tautomerism, providing examples for each. References for further reading are also included, highlighting key textbooks in organic chemistry.

Uploaded by

agrawalraj115
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© © All Rights Reserved
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BP202T.

PHARMACEUTICAL ORGANIC
CHEMISTRY –I (Theory)

Prepared by Dr.Rajnandini singha


Assistant Professor

Classification,
Classification, Nomenclature
Nomenclature and
and Isomerism
Isomerism
Structural isomerisms in organic compounds
Structural isomerisms in organic compounds

PART 2

Structural isomerism in organic compounds

Structural isomerism : In structural isomerism,the isomer have the same


molecular formula but differ in structural formula i.e physical and chemical
formula .

Types of Structural isomerism

1. Chain isomerism- e.g.n-butane and isobutane

2. Position isomerism- e.g. 1-bromobutane and 2-bromobutane

3. Functional isomerism- e.g. ethyl alcohol and dimethyl ether

4. Metamerism-e.g diethyl ether and propyl ether 5. tautomerism – e.g. keto form
and enol form

Structural isomerism
1.Chain isomerism: chain isomers have the same molecular formula but differ in
the order in which the carbon atoms are bonded to each other.

2. Position isomerism: Position isomers have same molecular formula but differ in
the position of a functional group on the carbon chain.

3. Functional isomerism: Functional isomers have the same molecular formula


but different functional groups.

4. Metamerism: this type of isomerism is due to the unequal distribution of carbon


atoms on either side of functional group.

5. Tautomerism: It is a special type of functional isomerism in which the isomers


are in dynamic equilibrium

References:

• A textbook of organic chemistry,22nd edition, Arun bahl,B S Bahl,S.Chand


publishing. Pg no;150-179,121-149.
• Organicchemistry;7thedition;RobertThortonMorrision,S.K.Bhattarcharje,
Pearson,Pg no:5,6,8
• Organic chemistry;5thedition;volume 2 stereochemistry and the chemistry
natural products ;I.L Finar, Pearson,Pg no:83

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