HELLO MY NAME IS JANAKIRAMAN AND IM A 12 TH STANDARD STUDENT
RULES FOR IUPAC NAMING
1. Select the longest continuous chain of carbon atoms (root word) containing the functional
group (-OH ).
2. Number the carbon atoms in the chain so that the carbon bearing the -OH group has the
lowest possible number.
3. Name the substituent (if any)
4. Write the name of the alcohol as below.
Prefix + Root word + Primary suffix + Secondary suffix
(substituents) (longest chain) (Saturation /unsaturation) (ol)
hydroxy compound
Classification of alcohol.
Alcohols can be classified based on the number of hydroxyl groups and the nature of the
carbon to which the functional group (–OH) is attached.
Alcohols
(Monohydric alcohols)
containing only one - OH group
CH3 - CH2 - OH(ethanol)
(Polyhydric alcohols)
containing more than
one -OH group
-OH group attached to
sp3 hybridised carbon
-OH group attached to
sp2
hybridised carbon
eg: vinyl alcohol
CH2 = CH - OH
ethenol
–OH group attached to
alkyl group
1 alcohol CH3 -C-OH
H
H
ethanol
CH2 = CH - CH2 - OH
Prop-2-en-1-ol
3 12 C6H5 - CH2 - OH
Phenylmethanol
alcohol CH3 -C-OH
CH3
H
propan-2-ol
CH2 = CH - CH - OH
1
3 2
C6H5 - CH - OH 2 4
CH3
-3-en-2-ol
CH3 2
1
1-phenylethanol
alcohol CH3 -C-OH
CH3
CH3
CH2 = CH-C- OH
1
4 23
C6H5 3 -C-OH
CH3
CH3
2-methylpropan-2-ol 2-methylbut-3-en-2-ol
CH3
CH3
2-phenylpropan-2-ol
HELLO MY NAME IS JANAKIRAMAN AND IM A 12 TH STANDARD STUDENT RULES FOR IUPAC NAMING 1. Select the longest continuous chain of carbon atoms ...
