Question

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 $B{r}_2$ water, ‘invert sugar’ forms saccharic acid as one of the products.

Answer 1

Answer: 2

Invert sugar is an equimolar mixture of D -(+) glucose and D(-) glucose.

Specific rotation of invert sugar $=\frac{-92^o+52^o}{2}=-20^o$
D-glucose on oxidation with $B{r}_2$ -water produces gluconic acid and not saccharic acid.