The correct $\mathrm{IUPAC}$ name of the compound $\stackrel{\underset{|}{\mathrm{OH}}}{{\mathrm{CH}}_2}-\stackrel{\underset{|}{\mathrm{OH}}}{\mathrm{CH}}-\stackrel{\underset{|}{\mathrm{OH}}}{\mathrm{CH}}-\underset{\stackrel{\left|\right|}{\mathrm{O}}}{\mathrm{C}}-{\mathrm{CH}}_3$ is:

Which one among the following is not diastereomeric pair.

What is the relationship between $\left(\mathrm{I}\right)$ $\&\left(11\right)$

Identify the correct order of melting point of the following compounds:

Decreasing order of melting point of compound $\mathrm{I}-\mathrm{IV}$ follows: