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

$L$-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 structures of $D$-glucopyranose obtained from $D$-glucose called?

Which of the following does not exhibit mutarotation?

Which of the following is a carbohydrate?

Only two carbon atoms of glucose participate in the formation of osazone because they undergo .......