Question

A chemist has 4 samples of artificial sweetener A, B, C and D. To identify these samples, he performed certain experiments and noted the following observations :

(i) A and D both form blue-violet colour with ninhydrin.

(ii) Lassaigne extract of C gives positive AgNO3 test and negative Fe4[Fe(CN)6]3 test.

(iii) Lassaigne extract of B and D gives positive sodium nitroprusside test

Based on these observations which option is correct ?

(1) A : Aspartame; B: Saccharin;

C: Sucralose; D; Alitame

(2) A: Alitame; B: Saccharin;

C: Aspartame; D; Sucralose

(3) A: Saccharin; B: Alitame;

C: Sucralose; D; Aspartame

(4) A: Aspartame; B: Alitame;

C: Sacchrin; D; Sucralose

Answer 1

Answer is (1)

(i) Blue voilet ***** with Ninhydrine → amino acid derivative. So it cannot be saccharide or sucralose.

(ii) Lassaigne extract give +ve test with AgNO3. So Cl is present, –ve test with Fe4[Fe(CN)6]3 means N is absent. So it can't be Aspartame or Saccharine or Alitame, so C is sucralose.

(iii) Lassaigne solution of B and D given +ve sodium nitroprusside test, so it is having *, so it is Saccharine and Alitame.