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

Question

Affinity for hydrogen decreases in the group from fluorine to iodine. Which of the halogen acids should have highest bond dissociation enthalpy? (A) HF (B) HCl (C) HBr (D) HI

Tardigrade Admin · Accepted Answer

F being smallest has the shortest HF bond and hence HF has the highest bond dissociation energy.

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

$H F$

$H Cl$

$H B r$

$H I$

$F$ being smallest has the shortest $H F$ bond and hence $H F$ has the highest bond dissociation energy.