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Organic Chemistry

Cool goIITian

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10 Feb 2012 22:32:42 IST

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Nomenclature

Chemistry

How 2 kno which is the main functional grp n which r substituent in a structure?????

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JoAnn Paul

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Joined: 11 Apr 2011

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11 Feb 2012 15:24:15 IST

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The order of decreasing priority for the functional groups is :

-COOH > -SO₃H > -COOR (ester)> COCl > CONH2 >-CN > HC=0 > >C=O (ketone) >-OH >-NH₂ > -R-O-R' (ether) > >C=C< > >C=- C (triple bond)< halogens

i.e if the chain has a carboxylic acid group and an alcohol group then the word root should be taken considering the acid group and not the alcohol......

eg- 2- hydroxy-butanoic acid

1 2 3 4

CH₃-CH₂-CH(OH)-COOH (here OH gp is the substituent gp.....)

Jayant Agarwal

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12 Feb 2012 13:52:32 IST

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Use the priority table for naming the func. grps.:

-COOH > -SO₃H > -COOR > COCl > CONH₂ >-CN > HC=0 > =C=O > -OH > -NH₂ > -R-O-R' > Double bond > Triple bond

passionate 4 iit

Cool goIITian

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13 Feb 2012 01:00:13 IST

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do v hav 2 byheart these tables or there is any method...????

JoAnn Paul

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Joined: 11 Apr 2011

Posts: 13

15 Feb 2012 08:33:33 IST

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u got to byheart it.....theres no odr way..... :( :)

passionate 4 iit

Cool goIITian

Joined: 3 Feb 2012

Posts: 64

20 Feb 2012 14:01:07 IST

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kk.. thnx

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