The rapid interconversion of $\alpha-D$-glucose and $\beta-D$-glucose in solution is known as:

Identify the product $Y$ in the following reaction:
$\text{Maltose}$ $\xrightarrow{\text{Hydrolysis}} X$ $\xrightarrow{\text{dil. HNO}_3 \text{ (excess)}} Y$

For 'invert sugar',the correct statement$(s)$ is(are)
(Given: specific rotations of $(+)$-sucrose,$(+)$-maltose,$L-(-)$-glucose and $(+)$-fructose in aqueous solution are $+66^{\circ}, +140^{\circ}, -52^{\circ}$ 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 $Br_2$ water,'invert sugar' forms saccharic acid as one of the products

State the importance of carbohydrates.

Which of the following is a disaccharide?

$\alpha-D$-glucose and $\beta-D$-glucose differ from each other due to the difference in the configuration of one of the carbons.