Observe the following reactions. Identify the reaction in which the hybridisation of underlined atom is changed

Among the following species, correct set of isostructural pairs are $\mathrm{XeO}_3, \mathrm{CO}_3^{2-}, \mathrm{SO}_3, \mathrm{H}_3 \mathrm{O}^{+}, \mathrm{ClF}_3$

The correct order of bond angles of the molecules $\mathrm{SiCl}_4, \mathrm{SO}_3, \mathrm{NH}_3, \mathrm{HgCl}_2$ is

$$ \text { Observe the following structure, } $$

$$ \text { The formal charges on the atoms 1,2,3 respectively are } $$