Question

Do all the halogens show the same reactivity with methane?

Answer 1

No

Explanation:

the reactivity of the halogens with `CH_4` decreases with in the group due the less electronegativity

`CH_4+4F_2=> CF_4+4HF` `at low temperature`
`CH_4+4Cl_2=>CCl_4+4HCl` `at slightly high temperature`
`CH_4+4Br_2=>CBr_4+4HBr` `(at moderatly high temperature)`
`CH_4+4I_2<=>_(catalyst)CI_4+4HI`(even at high temperature)#