In which of the following reaction most stable enol is present.

Give the reactivity order towards $\mathrm{EAR}$.

Arrange the following in the correct order of reactivity towards ${\mathrm{Cl}}_2/\mathrm{h\nu }$:

$\left(\mathrm{A}\right)$ ${\mathrm{CH}}_4$
$\left(\mathrm{B}\right)$ ${\mathrm{CH}}_3{\mathrm{CH}}_3$
$\left(\mathrm{C}\right)$ ${\mathrm{CH}}_3{\mathrm{CH}}_2{\mathrm{CH}}_3$

$\left(\mathrm{D}\right)$ ${\mathrm{CH}}_3-\stackrel{\underset{|}{{\mathrm{CH}}_3}}{\mathrm{C}}\mathrm{H}-{\mathrm{CH}}_3$