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For the reaction, C2H5OH + HX + ZnX→ C2H5X

The decreasing order of reactivity of halogen acids is: 

 (1)  HI > HCl > HBr 

(2)  HI > HBr > HCl 

(3)  HCl > HBr > HI 

(4)  HBr > HI > HCl 

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The decreasing order of reactivity of halogen acids is HI > HBr > HCl 

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