Question

How to convert methane to iodomethane.

Answer 1

Iodination is carried out in the presence of some oxidising agent like $HI{O}_{3}andHN{O}_3$ according to the following reaction.
$C{H}_4+I_2$ $\iff$ $C{H}_{3}I+HI$
$HI{O}_3+5HI$ $\to$ $3I_2+3H_{2}O$