Answer to Question #212128 in Organic Chemistry for Mahnoor

Question

1.     You will be given an unknown compound for which you will need to find out the chemical structure of compound. This unknown gives positive tests for both N and S elements in their Lassaigne’s test and soluble in sodium bicarbonate solution with effervescence, it will also contain amine functional groups but may also contain other functional groups as well. The compound gives following chemical tests of the qualitative analysis.                              (02)

Table-1: Results for Functional Group Test

Functional Group Test

(+ve)/(-ve)

Functional Group Test

(+ve)/(-ve)

Bromine test

(+ve)

Fehling’s test

(-ve)

Baeyer’s test

(+ve)

Lucas Test

(-ve)

Bicarbonate test

(+ve)

Biuret test

(-ve)

Esterification test

(+ve)

Nitrous acid test 

(+ve) (an azo dye is formed)

Tollen’s test

(-ve)

Carbylamine test

(+ve)

Answer 1

Structures of unknown compounds can be determined by comparing physical properties, performing functional group tests, and checking melting points of derivatives against those of known compounds reported in the literature. Solubility properties and chemical reactivity become apparent during these qualitative tests.