Order of reactivity of halogen acids towards an alcohol is:

HCl > HBr > HI

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HBr > HI > HCl

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HI > HBr > HCl

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HI > HCl > HBr

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Solution

The correct option is C HI > HBr > HCl
Longer the bond length, lesser will be dissociation energy and hence, more reactivity.
Among halogen acids bond length increases from HCl to HI.
$∴$ Order of reactivity of halogen acids towards alcohol is
$H I > H B r > H C l$

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