Hydrides of halogens :
Formation :
`H_(2)+F_(2)overset("dark condition")to2HF`
`H_(2)+Br_(2)overset("593 K")to2" HBr"`
`H_(2)+Cl_(2)overset("Sun light")to2" HCl"`
`H_(2)+I_(2)overset("713 K")to2" HI"`
`to` These compounds dissolve in water to form hydrohalic acids.
`{:(to,"Boiling points",,HF,,-,293" K"),(,,,HCl,,-,189" K"),(,,,HBr,,-,206" K"),(,,,HI,,-,238" K"):}`
`to` The decreasing order of stability of these compounds is
`HF gt HCl gt HBr gt HI`
`to` The increasing order of acicid strength of these compounds
`HF lt HCl lt HBr lt HI`
