From the given covalent compounds (A to F) identify the pair of molecules which have:

(i) Two lone pairs of electrons on the central atom.

(ii) One lone pair of electrons on the central atom.

A. $\mathrm{SO}_2$
B. $\mathrm{ClF}_3$
C. $\mathrm{BF}_3$
D. $\mathrm{BrF}_5$
E. XeF ₄
F. $\mathrm{SF}_6$

Identify the pair of molecules in which one of them is a molecule with an odd electron and the other has an expanded octet.

Which of the following two molecular species are Diamagnetic in nature?

$$[\mathrm{A}]=\mathrm{O}_2^{-} \quad[\mathrm{B}] .=\mathrm{N}_2^{+} \quad[\mathrm{C}]=\mathrm{C}_2 \quad[\mathrm{D}]=\mathrm{O}_2{ }^{2-}$$

Choose the incorrect statement from the following:

A. Isoelectronic molecules/ions have the same bond order.

B. Dipole moment of $$\mathrm{NH}_3$$ is greater than that of $$\mathrm{NF}_3$$.

C. The Carbon in Methyl Carbocation is $$\mathrm{sp}^3$$ hybridised.

D. The stability of an ionic compound is measured in terms of its lattice enthalpy and not simply based on attaining Octet configuration.