Question

For 'invert sugar', the correct statement(s) is (are):
(Given : specific rotations of (+) -sucrose, (+)-maltose, L-(-) glucose and L-(+) fructose in aqueous solution are $+{66}^{\circ },+{140}^{\circ },–{52}^{\circ }\text{and}+{92}^{\circ }$,
respectively)

• 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 $-{20}^{\circ }$
• D. On reaction with $B{r}_2$ water, ‘invert sugar’ forms saccharic acid as one of the products

Answer 1

Answer: (B), (C)

Specific rotation of ‘invert sugar’ is $-{20}^{\circ }$

$Sucrosehydrolysis\to D(+)-Glucose\left[\alpha \right]=(+{52}^{\circ })+D(-)Frcutose\left[\alpha \right]=(-{92}^{\circ })$
$Netspecificrotationofanequimolarmixture=\frac{52-92}{2}$
$\Rightarrow \frac{-40}{2}=-{20}^{\circ }$