The moist $\mathrm{SO}_2$ has reducing character due to evolution of nascent hydrogen.$\mathrm{SO}_2 + 2\mathrm{H}_2\mathrm{O} \rightarrow \mathrm{H}_2\mathrm{SO}_4 + 2[\mathrm{H}]\mathrm{Cl}_2$ acts as bleaching agent, $\mathrm{Cl}_2 + \mathrm{H}_2\mathrm{O} \rightarrow \mathrm{HCl} + \mathrm{HClO}$Hypochlorous acid is unstable, It easily dissociates to form nascent oxygen.$\mathrm{HClO} \rightarrow \mathrm{HCl} + [\mathrm{O}]$ due to nascent oxygen it act as bleaching agent.$\mathrm{XeF}_2 \rightarrow$ Linear, but $\mathrm{XeF}_6 \rightarrow$ distorted octahedral $\mathrm{N}_2 \rightarrow$ Very less reactive gas, and $\mathrm{F}_2$ highly reactive gas. $\mathrm{NH}_3 \rightarrow$ Strong base, $\mathrm{HI} \rightarrow$ Strong acid.