In which of the following molecules are all the bonds not equal?

The sets of molecules in which the central atom has no lone pair of electrons are:
$i$. $SnCl_2, NH_3, SF_4$
$ii$. $HgCl_2, SO_3, SF_6$
$iii$. $BeCl_2, BF_3, PCl_5$
$iv$. $ClF_3, BrF_5, XeF_6$

What is the number of lone pairs of electrons on $Xe$ in $XeF_2$?

Select the correct statement regarding the shapes of $PCl_5$,$BrF_5$,and $IF_7$.

The geometry of $XeOF_4$ by $VSEPR$ theory is

The bond angle in $NF_{3}$ $(102.3^{\circ})$ is smaller than $NH_{3}$ $(107.2^{\circ})$. This is because of