Choose the correct order for the given properties.

Which of the following molecules does not form in the $I^{st}$ excited state of the central atom?

The correct order as indicated in each option 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 $XeF_4$.

Ionic and covalent bonds are present in

Choose the correct order for the given property.
$M.P. \to$ Melting Point; $S \to$ Solubility