Question

Which one of the following hydrogen halides has the least bond dissociation enthalpy?

• A. $HF$
• B. $HBr$
• C. $HI$
• D. $HCl$

Answer 1

Answer: (C)

$HI$

Answer 2

As the size of halogen increases from $F$ to $I$, the bond dissociation energy decreases