In which of the following sets of molecules, the centil atoms of molecules have same hybridisation?

The correct increasing order of number of lone pair of electrons on the central atom of $\mathrm{SnCl}_2, \mathrm{XeF}_2, \mathrm{CIF}_3$ and $\mathrm{SO}_3$ is

The bond lengths of diatomic molecules of elements $X$, $Y$ and $Z$ respectively are 143, 110 and 121 pm . The atomic numbers of $X, Y$, and $Z$ respectively are

The correct formula used to determine the formal charge (Q) on an atom in the given Lewis structure of a molecule or ion is ( $V=$ number of valence electrons in free atom, $U=$ number of unshared electrons on the atom, $B=$ number of bonds around the atom)