$$ \stackrel{\bullet}{\mathrm{Cl}}+\mathrm{CH}_{4} \rightarrow \mathrm{A}+\mathrm{B} $$

A and B in the above atmospheric reaction step are :

1. A $\mathrm{C}_{2} \mathrm{H}_{6}$ and $\mathrm{Cl}_{2}$
2. B $\stackrel{\bullet}{\mathrm{C}} \mathrm{HCl}_{2}$ and $\mathrm{H}_{2}$
3. C $\stackrel{\bullet}{\mathrm{C}}\mathrm{H}_{3}$ and $\mathrm{HCl}$ Correct answer
4. D $\mathrm{C}_{2} \mathrm{H}_{6}$ and $\mathrm{HCl}$