Do all the halogens show the same reactivity with methane?

Sep 18, 2015

No

Explanation:

the reactivity of the halogens with $C {H}_{4}$ decreases with in the group due the less electronegativity

$C {H}_{4} + 4 {F}_{2} \implies C {F}_{4} + 4 H F$ $a t l o w t e m p e r a t u r e$
$C {H}_{4} + 4 C {l}_{2} \implies \mathbb{C} {l}_{4} + 4 H C l$$a t s l i g h t l y h i g h t e m p e r a t u r e$
$C {H}_{4} + 4 B {r}_{2} \implies C B {r}_{4} + 4 H B r$$\left(a t \mod e r a t l y h i g h t e m p e r a t u r e\right)$
$C {H}_{4} + 4 {I}_{2} {\iff}_{c a t a l y s t} C {I}_{4} + 4 H I$(even at high temperature)#