Question

A chemist has 4 samples of artificial sweetener, he performed certain experiments and noted the following observations:
(i) A and D both from blue-voilet colour with ninhydrin.
(ii) Lassaigne extract of C gives positive $AgN{O}_3$ test and negative $F{e}_4\left[Fe\right(CN{)}_6{]}_3$ 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: Saccharin;
  C: Aspartame;	D: Sucralose

• C.

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

• D.

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

Answer 1

The correct option is D

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

$\left(A\right)\to Aspartame;$
$\left(B\right)\to Saccharine;$
$\left(C\right)\to Sucralose;$
$\left(D\right)\to Alitame;$

(i) All $\alpha -$ amino acids on treatment with ninhydrin (2,2-dihydroxyindane-1,3-dione) give purple colouration. The purple coloures complex is Ruhemann's purple. This test is called ninhydrin test
Hence, A and D should be amino acids.

(ii) Positive test of lassaigne extract with $AgN{O}_3$ confirms the presence of halogen in the compound (C). Negative test of extract with sodium nitroprusside ensure the absence of nitrogen the compound (C). Hence, it is a sugar with halogen atom.

(iii) Lassaigne extract of B and D give Nitroprusside test which indicates the presence the nitrogen.
Saccharin has nitrogen atom and obviously amino acids have nitrogen atom.

Hence, option (d) is the correct answer.