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Question

(B) In halogen acids, as the size of the halogen atom increases, the bond strength between the halogen and hydrogen atom decreases. This makes the $H-

Vedclass · Accepted Answer

$HI > HBr > HCl$

Vedclass · Answer

(B) In halogen acids, as the size of the halogen atom increases, the bond strength between the halogen and hydrogen atom decreases. This makes the $H-X$ bond easier to break, facilitating the electrophilic addition reaction. The bond dissociation energy follows the order: $HCl > HBr > HI$. Therefore, the reactivity order for the addition reaction with ethylene is $HI > HBr > HCl$. Thus, the correct option is $(B)$.

The correct order of the addition reaction rates of halogen acids with ethylene is

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