Arrange the following hydrogen halides in order of their decreasing reactivity with propene.

H C l > H B r > H I

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H B r > H I > H C l

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H I > H B r > H C l

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H C l > H I > H B r

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Solution

The correct option is D $H I > H B r > H C l$
As the size of halogen increases, the strength of $H - X$ bond decreases and hence, reactivity increases.
Hence, the order of reactivity of hydrogen halides is $H I > H B r > H C l$ .

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