Question

which bond would you expect to have the lowest bond energy?
o h-f
o h-br
o h-i
o h-cl

Explanation:

Step1: Recall bond energy factors

Bond energy is related to bond length. Longer bonds have lower energy. Bond length increases with larger atomic radius of the halogen (since H - X bonds, X is halogen here: F, Cl, Br, I).

Step2: Compare atomic radii of halogens

Atomic radius order: \( F < Cl < Br < I \). So, H - I bond has the longest bond length among H - F, H - Br, H - Cl, H - I.

Step3: Determine bond energy

Longer bond length means lower bond energy. So H - I has the lowest bond energy.

Answer:

O H-I