Wednesday, January 16, 2008

Ch 34 Practical Organic Chemistry - Core Points

Practical organic chemistry:
Detection of elements (N, S, halogens);
Detection and identification of the following functional groups:
hydroxyl (alcoholic and phenolic),
carbonyl (aldehyde and ketone),
carboxyl, amino and nitro;
Chemical methods of separation of mono-functional organic compounds from binary mixtures.

The objective is to write 10 points

1.Lassaigne test is used for detecting N,S, halogens.
2.Sodium extract of the given compound is prepared first to do Lassaigne test.
3.Ferrous sulphate is used for nitrogen detection, acetic acid and lead acetate for detecting sulphur and NH4OH is used for detecting halogens.
4. Sodium test is used for detecting OH group
5. Ferric chloride test is used detecting phenolic group.
6. 2,4 dinitrophenylhydrazine test used to find the presence of carbonyl group.
7. Tollens reagent test is used for detecting aldehydic group.
8. If a carbonyl group is present, but aldehydic group is not detected, it means ketonic group is there.
9. Bicarbonate test will indicte carboxylic group -COOH
10. Isocyanide test will indicate presence of amine -NH2 group.

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