Identify the set of molecules in which the central atom has only one lone pair of electrons in their valence shells

The bond order of which of the following two species is same?

Which of the following sets are correctly matched?

(i) $\mathrm{B}_2 \mathrm{H}_6$ - electron deficient hydride

(ii) $\mathrm{NH}_3$ - electron precise hydride

(iii) $\mathrm{H}_2 \mathrm{O}$ - electron rich hydride

Which of the following is /are ionic in nature?

(i) $\mathrm{GeF}_4$

(ii) $\mathrm{SnF}_4$

(iii) $\mathrm{PbF}_4$

The correct option is