${\mathrm{C}}_{\mathrm{x}}{\mathrm{H}}_{\mathrm{y}} \left(\mathrm{A}\right)\stackrel{\mathrm{hot} \mathrm{Fe}}{\to }{\mathrm{C}}_m{\mathrm{H}}_{\mathrm{n}}\left(\mathrm{B}\right), \mathrm{A}$ is hydrocarbon with minimum value of ‘x’ 
$\mathrm{B}\stackrel{{\mathrm{Br}}_2,{\mathrm{CCl}}_4}{\to }$ no reaction

$\mathrm{B}\stackrel{1 \mathrm{equ}. {\mathrm{Br}}_2/\mathrm{Fe}}{\to }\mathrm{D}+\mathrm{E}$
$\mathrm{C}\stackrel{\mathrm{Ag}}{⟶}\mathrm{A}$
Total number of halogen atoms in one mole of each C,D and E are