Methane reacts with excess of chlorine in diffused sunlight to give the final product as:

This reaction is classified as:

Arrange in decreasing order of reactivity with $\mathrm{HCI}$:

${\mathrm{CCl}}_3-\mathrm{CH}={\mathrm{CH}}_2\stackrel{\text{ HOCI }}{⟶}\mathrm{P}$ (Major product),

${\mathrm{CCl}}_3^{}-\mathrm{CH}={\mathrm{CH}}_2\stackrel{\mathrm{HOCl}}{⟶}{}^{}\mathrm{P}^{}$; $\text{'}\mathrm{P}\text{'}$ is: