Affinity for hydrogen decreases in the group | vedclass

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(A) As the size of the halogen atom increases from $F$ to $I$,the $H-X$ bond length in halogen acids also increases from $HF$ to $HI$.Bond length orde

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$HF$

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(A) As the size of the halogen atom increases from $F$ to $I$,the $H-X$ bond length in halogen acids also increases from $HF$ to $HI$.Bond length order: $HF Due to the increase in bond length,the strength of the $H-X$ bond decreases from $HF$ to $HI$.Consequently,the bond dissociation enthalpy decreases from $HF$ to $HI$.The order of $H-X$ bond dissociation enthalpy $(kJ/mol)$ is: $HF (574.0) > HCl (428.1) > HBr (362.5) > HI (294)$.Therefore,$HF$ has the highest bond dissociation enthalpy.

Affinity for hydrogen decreases in the group from fluorine to iodine. Which of the halogen acids should have the highest bond dissociation enthalpy?

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