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Question
Affinity for hydrogen decreases in the group from fluorine to iodine. Which of the halogen acids should have the highest bond dissociation enthalpy?
Options
\[\ce{HF}\]
\[\ce{HCl}\]
\[\ce{HBr}\]
\[\ce{HI}\]
Solution
\[\ce{HF}\]
Explanation:
\[\ce{HF}\] On moving top to bottom \[\ce{HCl}\] Size of halogen atom increases \[\ce{HBr}\] H - X bond length increases \[\ce{HI}\] Bond dissociation enthalpy decreases
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