The reactivity of halogen acid with alkene to form haloalkanes are in the order:

H I > H B r > H C l > H F

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H F > H B r > H C l > H I

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H I > H F > H C l > H B r

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H I > H C l > H F > H B r

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Solution

The correct option is A $H I > H B r > H C l > H F$
The reactivity of halogen acid with alkene to form haloalkanes are in the order $H I > H B r > H C l > H F$ .
Thus with decrease in the size of halogen atom, the reactivity of halogen acid towards addition to alkene decreases.

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