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 $AgN{O}_3$ test and negative $F{e}_4[Fe(CN{)}_6{]}_3$ test.
(iii) Lassaigne extract of $B$ and $D$ gives positive sodium nitroprusside test.
Based on these observations which option is correct ?

• A. A : Alitame; B : Saccharin;
  C : Aspartame; D : Sucralose
• B. A : Saccharin; B : Alitame;
  C : Sucralose; D : Aspartame
• C. A : Aspartame; B : Alitame;
  C : Saccharin; D : Sucralose
• D. A : Aspartame; B : Saccharin;
  C : Sucralose; D : Alitame

Answer 1

Answer: (D)

(i) Blue voilet color with Ninhydrine $\to$ amino acid derivative. So it cannot be saccharide or sucralose.
(ii) Lassaigne extract give +ve test with $AgN{O}_3.$ So Cl is present, -ve test with $F{e}_4{\left[Fe{\left(CN\right)}_6\right]}_3$ 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 S, so it is Saccharine and Alitame.