Alcohols Phenols and Ethe question bank (Chemistry)

$\underset{\left(\text{Drastic condition}\right)}{\overset{{\text{KMnO}}_4,{\text{H}}_2{\text{SO}}_4,\Delta }{\to }}\text{X}\underset{\left(\text{Drastic conditions}\right)}{\overset{{\text{KMnO}}_{\text{4}},{\text{H}}_2{\text{SO}}_4,\Delta }{\to }}\text{Y}\underset{\left(\text{Drastic conditions}\right)}{\overset{{\text{KMnO}}_{\text{4}},{\text{H}}_2{\text{SO}}_4,\Delta }{\to }}\text{Z}$
The number of C-atoms present in the final product $\mathrm{\text{'}}\mathrm{Z}\mathrm{\text{'}}$ is

In which molecule, cleavage by $\mathrm{H}\mathrm{l}{\mathrm{O}}_4$ is not observed?