Which one of the following sets of monosaccharides forms sucrose?
A$\alpha -D-$galactopyranose and $\alpha -D$ glucopyranose
B$\alpha -D-$glucopyranose and $\beta -D-$ fructofuranose
C$\beta -D-$glucopyranose and $\alpha -D-$fructofuranose
D$\alpha -D-$glucopyranose and $\beta -D-$ fructopyranose.
AIPMT 2012, Medium
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B$\alpha -D-$glucopyranose and $\beta -D-$ fructofuranose
b Sucrose is composed of $\alpha$ -D-glucopyranose and a $\beta-D$ -fructofuranose units which are joined by $\alpha, \beta$ -glycosidic linkage between $\mathrm{C}-1$ of the glucose unit and $\mathrm{C}-2$ of the fructose unit
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When sugar ' $X$ ' is boiled with dilute $H _{2} SO _{4}$ in alcoholic solution, two isomers ' $A$ ' and ' $B$ ' are formed. $'A'$ on oxidation with $HNO _{3}$ yields saccharic acid where as ' $B$ ' is laevorotatory. The compound ' $X$ ' is ....... .