1.

Correct orderof increasing reactivity of HX towareds alkenes is

Answer»

`HF lt HBR gt HI gt HCl `
`HF lt HBr lt HCl lt HCl `
` HF lt Hl lt HBr lt HCl`
`HF lt HCl lt HBr lt Hl`

Solution :The reactivity of HX molecule DEPENDS upon bond length between H-X. More the bond lengh more the reactivity. From F to I atomic size as WELL as bond length increases. Hence reactivity order is `HF lt HCl lt HBr lt HI`


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