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QJEEAdv16Ch252f: JEE Advanced 2016 Chemistry - Class 12 JEEAdv16Ch252f Solution: For "invert sugar", the correct statement(s) is(are) (Given :…

For "invert sugar", the correct statement(s) is(are)

(Given : specific rotations of (+)-sucrose, (+)-maltose, L-(−)-glucose and L-(+)-fructose in aqueous solution are +66∘, +140∘, −52∘ and +92∘, respectively.)

Multiple Choice Options

  • A "invert sugar" is prepared by acid catalyzed hydrolysis of maltose.
  • B "invert sugar" is an equimolar mixture of D-(+)-glucose and D-(−)-fructose.
  • C specific rotation of "invert sugar" is −20∘.
  • D on reaction with Br2 water, "invert sugar" forms saccharic acid as one of the products.

Step-by-Step Verified Solution

Invert sugar is prepared by acid catalyzed hydrolysis of sucrose.

C12H22O11+H2O⟶HClC6H12O6D−(+)−Glucos⁡e+C6H12O6D−(−)−Fructose⏟Invertsugar

Specific rotation of invert sugar is

[α]mix = 0.5 × (+52) + 0.5 × (−92) = + 26 − 46 = −20∘

On reaction with Br2 water, invert sugar forms gluconic acid as one of the products. Br2 water oxidises glucose into gluconic acid and fructose is not oxidised by it.

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