iii. No. of electron in ONF = 24

No. of electron in ${\mathrm{N}\mathrm{O}}_2^{-}=24$

Both are isoelectronic.

iv. $\mathrm{O}{\mathrm{F}}_2$ is a fluoride of oxygen not oxide of fluorine because EN of fluorine is more than oxygen.

$\mathrm{O}{\mathrm{F}}_2=\mathrm{O}\mathrm{x}\mathrm{y}\mathrm{g}\mathrm{e}\mathrm{n}\mathrm{ }\mathrm{d}\mathrm{i}\mathrm{f}\mathrm{l}\mathrm{u}\mathrm{o}\mathrm{r}\mathrm{i}\mathrm{d}\mathrm{e}$

i. $\mathrm{C}{\mathrm{l}}_2{\mathrm{O}}_7$ is an anhydride of perchloric acid.

$2\mathrm{H}\mathrm{C}\mathrm{l}{\mathrm{O}}_4\stackrel{\mathrm{\Delta },\mathrm{ }-{\mathrm{H}}_2\mathrm{O}}{\to }\mathrm{ }\mathrm{C}{\mathrm{l}}_2{\mathrm{O}}_7$

ii. ${\mathrm{O}}_3$ molecules is bent
shape.