Write the essential conditions for geometrical isomerism.

Which of the following can show geometrical isomerism.

$\left(\mathrm{i}\right)$

$\left(\mathrm{ii}\right)$ 

$\left(\mathrm{iii}\right)$ 

$\left(\mathrm{iv}\right)$ 

$\left(\mathrm{v}\right)$ 

$\left(\mathrm{vi}\right)$

$\left(\mathrm{vii}\right)$ 

$\left(\mathrm{viii}\right)$ ${\mathrm{CH}}_2=\mathrm{CH}-\mathrm{CH}=\mathrm{CH}-\mathrm{Ph}$

Which of the following carbonyl compound will give two products after reaction with ${\mathrm{NH}}_2\mathrm{OH}$ ?

(i) $\left(\mathrm{ii}\right)$ ${\mathrm{CH}}_3-\mathrm{CHO}$   $\left(\mathrm{iv}\right)$ $\text{DCHO}$ 

Find $\mathrm{R}/\mathrm{S}$ configuration of following compounds.

Find $\text{D/L}$ configuration in the following molecules.

The $\mathrm{R}/\mathrm{S}$ configuration of following compounds are:

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.