Verified Solution • 2025–26 Session
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QJEEM20Chd295: JEE Main 2020 Chemistry - Class 12 JEEM20Chd295 Solution: A chemist has 4 samples of artificial sweetener A, B, C and D.…
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 ?
(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 ?
Multiple Choice Options
- A A : Aspartame ; B : Alitame ; C : Saccharin ; D ; Sucralose
- B A : Alitame ; B : Saccharin ; C : Aspartame ; D ; Sucralose
- C A : Aspartame ; B : Saccharin ; C : Sucralose ; D ; Alitame
- D A : Saccharin ; B : Alitame ; C : Sucralose ; D ; Aspartame
Step-by-Step Verified Solution
(i) A and D give positive test with ninhydrin because both have free carboxylic and amine group. Both aspartame and alitame contains amino acids.
(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 a sulphur containing compound, Saccharine and Alitame also contains sulphur.
C = Sucralose, D = Alitame.
(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 a sulphur containing compound, Saccharine and Alitame also contains sulphur.
C = Sucralose, D = Alitame.