Correct Answer: D. HI
Detail about MCQs
The bond energy of a molecule generally increases as you go down a group in the periodic table due to larger atoms and increased overlap of orbitals. Among the given options, HCl, HF, HBr, and HI are all hydrogen halides.
So, the molecule with the highest bond energy is:
D. HI (Hydrogen Iodide)
Hydrogen iodide (HI) has the highest bond energy among these options because iodine is the heaviest halogen atom, and the bond between hydrogen and iodine is the weakest and has the highest bond energy among hydrogen halides.