Which of these is least likely to act as a Lewis base?

The Born-Haber cycle is used to determine:

Number of molecules from the following which are exceptions to the octet rule is. . . .
$CO_2, NO_2, H_2SO_4, BF_3, CH_4, SiF_4, ClO_2, PCl_5, BeF_2, C_2H_6, CHCl_3, CBr_4$

Which of the following sets are correctly matched?

Molecule	Number of lone pairs of electrons on central atom	Hybridization
$I. PCl_3$	$1$	$sp^3$
$II. SO_2$	$1$	$sp^2$
$III. SF_4$	$1$	$sp^3d$
$IV. ClF_3$	$2$	$sp^3d$

Incorrect statement regarding $N(SiH_3)_3$ is

Which of the following statements is incorrect?
$(i)$ $NaCl$,being an ionic compound,is a good conductor of electricity in the solid state.
$(ii)$ In canonical structures,there is no difference in the arrangement of atoms.
$(iii)$ Hybrid orbitals form stronger bonds than pure orbitals.
$(iv)$ $VSEPR$ theory can explain the square planar geometry of $XeF_4$.