1. Tardigrade
  2. Question
  3. Chemistry
  4. For ‘invert sugar’, the total number of 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) (I) ‘invert sugar ’ is prepared by acid catalyzed hydrolysis of maltose. (II) ‘invert sugar’ is an equimolar mixture of D-(+)-glucose and D-(-)-fructose. (III) specific rotation of ‘invert sugar’ is -20°. (IV) on reaction with Br2 water, ‘invert sugar’ forms saccharic acid as one of the products.

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Q. For ‘invert sugar’, the total number of correct statement(s) is(are)
(Given : specific rotations of (+) -sucrose, (+)-maltose, L-(-)-glucose and L-(+) fructose in aqueous solution are
$ + 66^{\circ}, +140^{\circ}, -52^{\circ}$ and $ + 92^{\circ}$, respectively)
(I) ‘invert sugar ’ is prepared by acid catalyzed hydrolysis of maltose.
(II) ‘invert sugar’ is an equimolar mixture of D-(+)-glucose and D-(-)-fructose.
(III) specific rotation of ‘invert sugar’ is$ -20^{\circ}$.
(IV) on reaction with $Br_{2}$ water, ‘invert sugar’ forms saccharic acid as one of the products.

Biomolecules

Solution:

Invert sugar is an equimolar mixture of D -(+) glucose and D(-) glucose.
image
Specific rotation of invert sugar $= \frac{-92^{o} +52^{o}}{2} = -20^{o}$
D-glucose on oxidation with $Br_{2}$ -water produces gluconic acid and not saccharic acid.