$CHC{{l}_{3}}\xrightarrow{HN{{O}_{3}}}CC{{l}_{3}}N{{O}_{2}}$
or $C{{H}_{3}}N{{O}_{2}}\xrightarrow[NaOH]{C{{l}_{2}}}\underset{chloropicrin}{\mathop{CC{{l}_{3}}N{{O}_{2}}}}\,$
${CH}_{4}+{I}_{2} \underset{\text { Reversible }}{\stackrel{{hv}}{\longrightarrow}} {CH}_{3}-{I}+{HI}$