The change in optical rotation with time of a freshly prepared solution of sugar is known as:

$L$-isomer of tetrose $X$ $(C_4H_8O_4)$ gives positive Schiff's test and has two chiral carbons. On acetylation,$X$ yields triacetate. $X$ also undergoes the following reactions:
$X$ $\xrightarrow{HNO_3} A$ $\xrightarrow{NaBH_4} \underset{\text{Chiral compound}}{B}$
$X$ is $.......$.

What are the two forms of $D$-glucopyranose obtained from $D$-glucose called?

The pentose sugar in $DNA$ and $RNA$ has a ......... structure.

In which of the following carbohydrates does the molecular mass increase by $84 \ u$ after complete acetylation?

Classify the following into monosaccharides and disaccharides:
Ribose,$2-$deoxyribose,maltose,galactose,fructose,and lactose.