(A)

Sucrose does not have an aldehydic or ketonic group. Hence sucrose is a non-reducing sugar and does not give reddish brown precipitate with Fehling’s reagent. All monosaccharides (such as glucose) are reducing sugars.

(D)

    A. Epimers are diastereomers that differ in configuration at only one chiral centre. $\mathrm{\alpha }$-Glucose and $\mathrm{\alpha }$-Galactose are C-4 epimers.

   B. Anomers are epimers which differ in configuration at acetal or hemiacetal carbon. $\mathrm{\alpha }$-D-glucose and $\mathrm{\beta }$-D-glucose are anomers.

   C. Glucose is an aldohexose and fructose is a ketohexose. These are thus functional isomers.

   D. Formula of glucose (${\mathrm{C}}_6{\mathrm{H}}_{12}{\mathrm{O}}_6$) differs by — ${\mathrm{CH}}_2$ unit with the formula of ribose (${\mathrm{C}}_5{\mathrm{H}}_{10}{\mathrm{O}}_5$). So, Homologns

(D)

        1.  Glucose exists as equilibrium mixture of $\mathrm{\alpha }$-D-glucose, open chain structure and $\mathrm{\beta }$-D-glucose.

        2.  Sucrose is a disaccharide formed by glycosidic linkage between C1 of $\mathrm{\alpha }$-D-glucose and C2 of $\mathrm{\beta }$-D-fructose.

        3.  Glucose is an aldohexose.

        4.  Water solubility of glucose is because it forms extensive hydrogen bonding with water.