Which of the following is not a disaccharide?

$D-(+)-\text{Glyceraldehyde} \xrightarrow[(ii) H_2O/H^{+}]{(i) HCN, (iii) HNO_3}$
The products formed in the above reaction are

Among the following statements about the molecules $X$ and $Y$, which one$(s)$ is/are correct?

Sucrose is a

Which carbon atoms of $\alpha-D$-glucopyranose and $\beta-D$-fructofuranose respectively are linked together to form the glycosidic linkage in sucrose?

Starch can be used as an indicator for the detection of traces of