JEE Main 2020 — Chemistry In Everyday Life Question with Solution
From: JEE Main 2020 (Online) 9th January Morning Slot
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 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 ?
Choose an option
Show full solutionCorrect option: C
Correct answer
CA : Aspartame ; B : Saccharin ;
C : Sucralose ; D ; Alitame
Step-by-step explanation
(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.
A = Aspartame, B = Saccharin
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.
A = Aspartame, B = Saccharin
C = Sucralose, D = Alitame.
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