The units of monosaccharide present in raffinose are

Which of the following is $D$-isomer?

Assertion : Sucrose undergoes mutarotation.
Reason : Sucrose is a disaccharide.

The Fischer projection formula of $D-(-)$-fructose is:

The specific rotations of $\alpha-$ and $\beta-$ glucose are different. When either is dissolved in water,their rotation changes until a constant value is reached. This phenomenon is called ......

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