Number of  $\mathrm{\sigma }\hspace{0.17em}{\mathrm{sp}}^2-{\mathrm{sp}}^2$bonds present in a molecule of X in the process ${\mathrm{C}}_{\mathrm{6}}{\mathrm{H}}_{\mathrm{6}}\underset{ }{\overset{{\mathrm{H}}_{\mathrm{2}}/\mathrm{Ni}}{\to }}\mathrm{X}$ is 

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