How many peroxy linkages are present in ${\mathrm{H}}_2{\mathrm{S}}_2{\mathrm{O}}_8$?

In diborane, the ${\mathrm{H}}_{\mathrm{t}}-\mathrm{B}-{\mathrm{H}}_{\mathrm{t}}$ and ${\mathrm{H}}_{\mathrm{b}}-\mathrm{B}-{\mathrm{H}}_{\mathrm{b}}$ angles are:

(Where, $\mathrm{t}$ denotes terminal and $\mathrm{b}$ denotes bridge)

$2{\mathrm{CH}}_3\mathrm{Cl}+\mathrm{Si}\underset{300°\mathrm{C}}{\overset{\mathrm{Cu}}{\to }}\mathrm{X}\stackrel{2{\mathrm{H}}_2\mathrm{O}}{\to }\mathrm{Y}$

The incorrect statement for $\mathrm{X}$ and $\mathrm{Y}$ is