Naming of Organic Compounds containing multiple bonds



1. Select longest continuous chain of c-atom containing multiple bonds.

Organic Compounds containing multiple bonds

2. If only one multiple bonds is present (either double or triple) then C-atom form where multiple bond begins, gets lowest position number.

Organic Compounds containing multiple bonds

3. If one type of multiple bond present more than one time, numbering should be done in a way such that the sum of locants would be lowest.
CH2=CH-CH=CH-CH3
Penta-2, 4-diene (wrong)
Penta-1, 3-diene (correct)
4. If both double and triple bond are present at equal position form the two ends then the double bond containing C-atom should get the lowest position number.
CH≡C-CH2-CH=CH2 (pent-1-en-4-yne)

 


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