Question

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

(1) $\mathrm{A}$ and $\mathrm{D}$ both form blue-violet colour with ninhydrin.

(2) Lassaigne extract of C gives positive ${\mathrm{AgNO}}_3$test and negative ${\mathrm{Fe}}_4{\left[\mathrm{Fe}{\left(\mathrm{CN}\right)}_6\right]}_3$test.

(3) Lassaigne extract of $\mathrm{B}$ and $\mathrm{D}$ 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

The correct option is D

A-Aspartame, B-Saccharin, C- Sucralose, D-Alitame

Answer (D)

Explanation for correct option:

It has free amine group and hence reacts with ninhydrin to give a purple color known as $\mathrm{Ruhemann}\text{'}\mathrm{s}$$\mathrm{purple}$

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

It has chlorine and hence it forms a precipitate with ${\mathrm{AgNO}}_3$ in the $\mathrm{Lassaigne}\text{'}\mathrm{s}$ extract of the sugar.

It has a free amine group and hence reacts with ninhydrin to give purple colour known as $\mathrm{Ruhemann}\text{'}\mathrm{s}\mathrm{purple}$. Also, it has Sulphur, therefore, it will give a positive test with sodium nitroprusside.

Hence option (D) is correct option.