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13.3 Formula of Organic Compounds

An organic compound can be designated by molecular or structural formula. It gives a concise and instantly recognizable description of the compound.

Molecular formula : It is the formula which expresses the exact number of atoms of each element present in the molecule and does not distinguish between isomers.

Structural formula : It describes the actual attachment of all atoms with one another in the molecule and distinguishes between isomers.

The following table (21) illustrates how these formulae are used to represent the compound.


Note that entries 2 and 3 have similar molecular formulae but different structural formula. Such compounds are called isomers. Structure affects both the chemical reactivity and physical properties of compounds as illustrated in following table 22.

Index

13.1 Introduction
13.2 Functional Groups

13.3 Formula of Organic Compounds
13.4 Geometrical Isomerism
13.5 Hydrocarbons
13.6 Homologous Compounds

Chapter 1





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