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. $HI$

Answer 1

Answer: (A)

$HF$

Answer 2

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