An unsaturated hydrocarbon X absorbs two hydrogen molecules on catalytic hydrogenation, and also gives following reaction :

$\mathrm{X}\underset{\mathrm{Zn}/{\mathrm{H}}_2\mathrm{O}}{\overset{{\mathrm{O}}_3}{\to }}\mathrm{A}\underset{}{\overset{{\left[\mathrm{Ag}{\left({\mathrm{NH}}_3\right)}_2\right]}^{+}}{\to }}\mathrm{B}(3-\mathrm{xox}-\mathrm{hexaedicarboxylic}\mathrm{acid})$

X will be :