IIT JEE , AIEEE Forum - Chemistry , Organic Chemistry

angelh

Some Classes of Organic Compounds by Functional Group

can u tell me when 2 use prefix or suffix for functional group for a compound has two or more than two functional group

i m also intrested to know which functional groups is given priority for nomenclature of organic compounds ith two or more than two functional group is present

arun-rashi

If more than 1 fuctional group is there in an compound we must decide PRINCIPAL FUNCTIONAL GROUP (which gives class of organic compound) using priority table P.F.G will be written as suffix & rest functional groups are written as prefixs for e.g if compound contains - OH as well as acidic group suffix will be oic acid & prefix is hydroxy for -OH grp -COOH has more priority than -OH

garima_1211

If 2 or more than 2 functional groups r present, the one having the highest priority is made the secondary suffix and all other r made the prefixes. The priority list is given below........

Decreasing Priority Order of Principle Characteristic Groups Identified by a Suffix
1.   Acids (in the order COOH, C(O)O2H; then their S and Se derivatives, followed by sulfonic, sulfinic, selenonic, etc., phosphonic, arsonic, etc., acids)
2.   Anhydrides
3.   Esters
4.   Acid halides
5.   Amides
6.   Hydrazides
7.   Imides
8.   Nitriles
9.   Aldehydes, followed by thioaldehydes & selenoaldehydes
10.   Ketones, followed by thioketones & selenoketones
11.   Alcohols and Phenols, followed by thiols & selenols
12.   Hydroperoxides, followed by thiohydroperoxides & selenohydroperoxides
13.   Amines
14.   Imines
15.   Hydrazines, Phosphanes, etc.
16.   Ethers followed by sulfides & selenides
1.   Peroxides, followed by disulfides & diselenides

Hope u got it..........Do rate me if useful!!!!!!!!!!

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