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JEE Advanced levelSingle correct optionDifficulty 3 of 3el136

Four unknown food additives were examined. A: nitrogen present, hydrolysed by dilute acid giving methanol, loses sweetness on boiling. B: contains three chlorine atoms per molecule, unchanged on baking at 180 degrees C, not metabolised for energy. C: contains sulphur and nitrogen, passes unchanged in urine. D: peptide-based, about 2000 times as sweet as sucrose. Which additive is a sucrose derivative that can be used to sweeten a baked cake for a diabetic person?

  1. AA
  2. BC
  3. CB
  4. DD

Answer: C

Three chlorine atoms per molecule and stability on baking identify sucralose, a trichloro derivative of sucrose that gives no calories. A is aspartame (decomposes on heating), C is saccharin (not a sucrose derivative) and D is alitame (a peptide-based sweetener). Hence the answer is B.
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