The general formula for a disaccharide is ...... .

The correct statement$(s)$ about the following sugars $X$ and $Y$ is(are):
$(A)$ $X$ is a reducing sugar and $Y$ is a non-reducing sugar
$(B)$ $X$ is a non-reducing sugar and $Y$ is a reducing sugar
$(C)$ The glycosidic linkages in $X$ and $Y$ are $\alpha$ and $\beta$,respectively
$(D)$ The glycosidic linkages in $X$ and $Y$ are $\beta$ and $\alpha$,respectively

Identify the monosaccharide containing only one asymmetric carbon atom in its molecule.

Which one of the following is the structure of lactose?

$\alpha-D-(+)$-glucose and $\beta-D-(+)$-glucose are

The number of chiral carbon atoms present in the open-chain structure of $D-(-)$-fructose is: