An unsaturated hydrocarbon $X$ absorbs two hydrogen molecules on catalytic hydrogenation, and also gives following reaction:
$\mathrm{X}\stackrel{\left(\mathrm{i}\right){\mathrm{O}}_3}{\underset{\frac{\left(\mathrm{ii}\right)\mathrm{Zn}}{{\mathrm{H}}_2\mathrm{O}}}{\to }}\mathrm{A}\stackrel{{\left[\mathrm{Ag}{\left({\mathrm{NH}}_3\right)}_2\right]}^{+}}{\to }\mathrm{B}$  (3-oxo-hexanedicarboxylic acid) $X$ will be: