The IUPAC name of CH3CH2CH2COOH is:

The  IUPAC name for a given compound is Butanoic acid.


  • The International Union of Pure and Applied Chemistry (IUPAC) is an international non-governmental organization that helps tackle the problems or issues concerning chemical science worldwide.
  • IUPAC nomenclature of organic compounds can be treated as the systematic and proper approach for the nomenclature of organic compounds as per norms and rules recommended by the International Union of Pure and Applied Chemistry (commonly abbreviated to IUPAC).

Rules Of Nomenclature

As per the Guidelines set by IUPAC, the nomenclature of compounds must follow the following steps:

  • The Longest Chain Rule:  The parent chain of the given compound generally the longest chain of carbon atoms is chosen,  and itis preferred to be in the form of a straight-chain or a chain of any other shape.
  • The Lowest Set of Locants: The carbon atoms belonging to the parent chain must be numbered using natural numbers and beginning from the end with the least number of the carbon atom which carries the substituents.
  • Multiple instances of the same substituent: The prefixes that indicate the total number of the same substituent group in the given compound is mentioned, such as di, tri, etc.
  • Naming of different substituents: In the organic compounds that contain multiple substituents, the corresponding substituents are arranged in alphabetical order of names as per the IUPAC nomenclature of compounds given.
  • The naming of different substituents present at the same positions: When two different substituent groups are present at the same position of the compound, the substituents are named in ascending alphabetical order.

The format for the IUPAC nomenclature of the Compound can be given as Locant + Prefix + Root + Locant + Suffix.

Given compound

We are given the compound  CH3CH2CH2COOH

We need to name the given compound as per the IUPAC nomenclature.

Nomenclature of given compund

  • The compound has a -COOH functional group. Hence we can start numbering the parent chain from the carbon-containing functional group.  So the group -COOH will have the numbering as 1 and the next carbon on the left with CH2 group as 2, then next carbon with CH2 group as  3 and the last carbon with CH3 group as 4.
  • As per the IUPAC norm, the chain with four carbon atoms is termed Bute
  • Since it is alkane (Only single bond), the name comprises the name ane
  • A functional group is acid
  • Hence, combining all the above points, the  IUPAC name for a given compound is Butanoic acid.

Butanoic acid in common language is termed as Butyric acid.

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