IUPAC Nomenclature (International Union of Pure and Applied Chemistry)
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Rules Guiding the IUPAC Nomenclature
According to IUPAC, below are the rules to follow in naming organic compounds:
- Select the longest continuous carbon chain as root and name it according to the number of carbon atoms it contains
- Number the carbon atoms in the root hydrocarbon from the end which will give the lowest number to the substituents e.g Alkyl group, radical or halogens, Cl for chlorine named as –chloro, F for Fluorine named as –floro, Br for Bromine named as –bromo, and l for Iodine named as –Iodo,
- If the same substituent is present two or more times in a molecule, the number of this substituent is indicated by the prefixes di-(2), tri-(3), tetra-(4), etc
- If there is more than one type of substituent in the molecule, they are named according to the alphabetical order
- In selecting and numbering the longer continuous chain, the functional groups are giving more preference over sustituents
Watch all these organic compound examples been named in the video tutorial above.
- CH3–CH2–CH2–C2H5-CH3
- CH3–CH2–CH=CH2
- ClH2–CH2–CH2–CH2OH
- CH3–CH2–CH2 (OH) –COOH –CH2-COOH
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Organic Chemistry Practice Questions
