It is another part of name that comes after the word root. There are two types of suffixes:
- Primary Suffix
- Secondary 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: CH3-CH2-CH=CH2 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)
It is used to indicate characteristics of functional group which is added to primary suffix.