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