${\text{K}}_{\text{H}}$ value for some gases at the same temperature ‘T’ are given,

$Gas$	${\text{K}}_{\text{H}}\text{/k\hspace{0.17em}bar}$
$Ar$	$40.3$
${\text{CO}}_{\text{2}}$	$1.67$
$HCHO$	$1.83\times {10}^{-5}$
${\text{CH}}_{\text{4}}$	$0.413$

Where ${\text{K}}_{\text{H}}$ is Henry’s Law constant in water. The order of their solubility in water is