Aldehydes : |
Fun. group formula
Fun. group name = Aldehyde OR formagroup
General formula : nH2no (n= 1,2,3...) or R-CHO
Defi :
The aldehydes are organic compounds containing functional group -CHO (aldehyde) is called aldehydes.
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| Formaldehyde |
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| Acetaldehyde |
1) Common name system :
i) Find the common name of corresponding carboxylic acid.
ii) Replace 'ic acid' of an acid with aldehyde term.
iii) Use the prefixes n, Iso & neo whenever needed.
IUPAC system :
Rule no.1:
I) Select the longest carbon chain with -CHO group.
II) Count the number of carbon atoms in normal chain with carbon atom of -CHO.
III) Find the name of parent alkane.
IV) Replace ending 'e' alkane with 'al' suffix.
V) Thus it become 'alkanal'.
Rule No.2:
Start numbering to normal chain carbon atoms from carbon atom of -CHO group.
Rule No.3:
Give the name & location of branched group.
Rule No. 4: If aldehyde contains 2,3,4 similar branched groups, use the prefixes di, tri & tetra respectively.
Rule No. 5:
If aldehyde possesses different Branched groups , mention their name by alphabetical order.
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