It is another part of name that comes after the word root. There are two types of suffixes:

  1. Primary Suffix
  2. Secondary Suffix


Primary Suffix:

It is used to indicate whether the parent chain is saturated or unsaturated.



Note: If primary suffix begins with consonant like di, tri, tetra, etc. then extra “a” should be added to word root.

For Instance:


Number of C-atoms = 4

Word root = but

Primary suffix = 1-ene (Here, 1 is the position of double bond)

IUPAC name = word root + primary suffix

= but + 1-ene

= but-1-ene

= 1-butene (Also correct)



Secondary Suffix

It is used to indicate characteristics of functional group which is added to primary suffix.








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