Consider the following sequence of reactions:

Which of the following statements is/are true for the compounds X, Y and Z ?

In all three compounds, the chromium is in +6 oxidation state.

Z is a deep blue-violet compound which can be extracted in to ether but decomposes rapidly in aqueous solution into $C{r}^{3+}$ and dioxygen.

Y oxidizes aqueous KI solution to ${\mathrm{KIO}}_3$ in presence of dilute sulphuric acid.

Z contains two oxygen – oxygen bonds