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Question

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

A
HCl>HBr>HI
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B
HBr>HI>HCl
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C
HI>HBr>HCl
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D
HCl>HI>HBr
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Solution

The correct option is D HI>HBr>HCl
As the size of halogen increases, the strength of HX bond decreases and hence, reactivity increases.
Hence, the order of reactivity of hydrogen halides is HI>HBr>HCl.

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