NOMENCLATURE - ORGANIC CHEMISTRY

NOMENCLATURE - ORGANIC CHEMISTRY

Rules of Nomenclature in IUPAC system:

The name of every compound consists of :

Prefix + Root word + primary suffix + secondary suffix.

Root word – indicates the number of Carbons present in the principal chain of the compound.

 Primary suffix – indicates the nature of the between the Carbon atoms in the principal chain.

Secondary suffix – indicates the functional group.

Prefix – indicates the substituent.

No. of Carbon atoms	Root word		Nature of the bond	Primary suffix
1	Meth		C – C single bond	ane
2	Eth		C = C double bond	ene
3	Prop		C º C triple bond	yne
4	But
5	Pent

Functional group	Secondary suffix		Substituent	prefix
– COOH	oic acid		– CH3	Methyl
– CHO	al		– C2H5	Ethyl
– CO –	one		– Cl	Chloro
– OH	ol		– Br	Bromo
			– I	Iodo