The correct order of reactivity of addition of hydrogen halides with alkene is:

HBr>HF>HCl>HI

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HCl>HBr>HI>HF

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HI>HBr>HCl>HF

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HF>HBr>HCl>HI

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Solution

The correct option is C HI>HBr>HCl>HF
The stability of hydrogen halides decreases down the group due to decrease in bond (H−X) dissociation energy in the order HF>HCl>HBr>HI. So, the addition of hydrogen halide with alkene will be in order HI>HBr>HCl>HF.

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The correct order of thermal stability of hydrogen halides (H – X) is

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