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 $F{e}_4\left[Fe\right(CN{)}_6{]}_3$ 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 – Alimate, C – Sucralose, D – Aspartame
• 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


It has a free amine group and hence reacts with ninhydrin to give a purple colour known as Ruhemann's purple.

It has Sulphur, therefore, it will give a positive test with sodium nitroprusside.

It has chlorine and hence it forms a precipitate with $AgN{O}_3$ in the Lassaigne’s extract of the sugar.
It has a free amine group and hence reacts with ninhydrin to give purple colour known as Ruhemann's purple. Also, it has Sulphur, therefore, it will give positive test with sodium nitroprusside.