give chemical test to distinguish between 1)aniline and ethylamine 2) Methyamine nad dimethylamine.

Part : I
1) Aniline and Ethylamine
Aniline gives positive test for coupling reaction.
Aniline reacts with benzene diazonium chloride in basic medium to give p-aminoazobenzene which is yellow in colour
Ethylamine  does not give  coupling reaction.

Reaction Involved :



Part - II
Methylamine and dimethylamine :
Methylamine is a primary amine hence it give carbylamine test. Dimethylamine being a secondary amine will not give
carbylamine test.

Reaction invovled :


 

  • 54

1, 4 ny distingusion wth aniline, azodye test is used as only aniline answers it.

aniline when treated with HNO2 @ 00 v get benzene diazonium chloride.when it is coupled with phenol, give orange azodye.but ethylamine on diazonisation give ethanol.

2. by hinsberg test.(C6H5SO2Cl)

in ur ques, methanamine is primary nd dimethyl amine is secondary

C6H5SO2Cl reacts wth primary and secondary amine 2 give sulphonamine

but 4 primary amine (as per ur question) the H atom attached 2 sulphonamine is strongly acideic due to the persence of electron withdrawing sulphonyl group.so it is soluable in alkali.

but in seconary amine the H atom attached 2 sulphonamine is not acidic nd hence insoluable in alkali.

  • 8
What are you looking for?