Give the Newman projection formula of the least stable staggered form of $\mathrm{n}-$butane. Which of the following reasons is the causes of its unstability?

($\mathrm{i}$) Vander Waals strain

($\mathrm{ii}$) Torsional strain

($\mathrm{iii}$) Combination of both

Newman projection of butane is given. If $\mathrm{C}-2$ is rotated by $120°$ along $\mathrm{C}-2$ and $\mathrm{C}-3$ bond in the anticlockwise direction, the conformation formed is

It is given that for conformational isomers, the net dipole moment is ${\mathrm{\mu }}_{\mathrm{obs}}={\mathrm{\Sigma \mu }}_{\mathrm{iXi}}$

Where, 

${\mathrm{\mu }}_{\mathrm{obs}}=$ Observed dipole moment of the compound

${\mathrm{\mu }}_{\mathrm{i}}=$ Dipole moment of the stable conformational isomers

${\mathrm{x}}_{\mathrm{i}}=$ Mole fraction of stable conformers

for the compound $\mathrm{Z}-{\mathrm{CH}}_2-{\mathrm{CH}}_2-\mathrm{Z}$, draw the Newman projection formula of all the stable conformational isomers, if ${\mathrm{\mu }}_{\mathrm{obs}}=1\mathrm{D}$, ${\mathrm{X}}_{\mathrm{anti}}=0.82$, and find ${\mathrm{\mu }}_{\mathrm{gauche}}$. Now, draw the Newman projection formula of the most stable conformation of meso $\mathrm{Y}-\mathrm{CHD}-\mathrm{CHD}-\mathrm{Y}$.

(a) If $\mathrm{Y}$ is ${\mathrm{CH}}_3$, (rotation about ${\mathrm{C}}_2-{\mathrm{C}}_3$ bond)

(b) If $\mathrm{Y}$ is $\mathrm{OH}$, (rotation about ${\mathrm{C}}_1-{\mathrm{C}}_2$ bond)

The correct statement(s) about the compound given below is/are

The correct statement(s) about the compound

${\mathrm{H}}_3\mathrm{C}\left(\mathrm{HO}\right)\mathrm{HC}-\mathrm{CH}=\mathrm{CH}-\mathrm{CH}\left(\mathrm{OH}\right){\mathrm{CH}}_3\left(\mathrm{X}\right)$ is (are)

In Newman projection, for $2, 2-$dimethylbutane, $\mathrm{X}$ and $\mathrm{Y}$ can respectively be

The number of optically active products that are obtained from the complete ozonolysis of the given compound are :-

Which of the given statements about $\mathrm{N}, \mathrm{O}, \mathrm{P}$ and $\mathrm{Q}$ with respect to $\mathrm{M}$ is/are correct?