Find the plane of symmetry and centre of symmetry (if possible) in the following compounds.

Find the plane of symmetry, center of symmetry and axis of symmetry (if possible) in the following molecules.

Identify the pairs of enantiomers and diastereomers from the following compounds $\mathrm{I}$, $\mathrm{II}$and $\mathrm{III}$:

Find the relationship between the given pairs.

($i$) Total number of fractions on fractional distillation of $\mathrm{I},$$II$ and $III$.
($ii$) Optical active compounds.
($iii$) Relation between $I$and $II$.
($iv$) Relation between $I$and $III$.

What does $D/L$ $\&$ $d/\mathcal{l}$ represent?

The total number of fractions ($n$) obtained in the following reaction is

Write the Newman projection formula of the following compounds:

(I) $\mathrm{Cl}-{\mathrm{CH}}_2-{\mathrm{CH}}_2-{\mathrm{CH}}_3$ in its most polar form.

(II) $\mathrm{HO}-{\mathrm{CH}}_2-{\mathrm{CH}}_2-\mathrm{OH}$ in its most stable form.

(III) $\mathrm{HOOC}-{\mathrm{CH}}_2-{\mathrm{CH}}_2-\mathrm{COOH}$ in its least stable staggered form.