Which of the following pairs of molecules have the almost equal bond dissociation energy?

A) Molecules                  Bond energy (KJ/mol)

      O=O                            498

      H−H                            436

oxygen molecule bond dissociation energy is higher than hydrogen 

B) Molecules                  Bond energy (KJ/mol)

      N≡N                           945
 

     - C≡O +                       1072
 

N≡N bond is comparably weaker than C=O bond due to presence of lone pair - lone pair repulsion resided on N atom.
 

C) Molecules                  Bond energy (KJ/mol)

      F−F                            156

      I−I                              151

The atomic radius of F atom is so small that the electrostatic repulsion between nuclei is significant and non-bonding electrons of F atoms repel each other. As a result F−F bond energy is almost identical with bond energy of I−I which is weaker due to formation of bond by sp orbital of I atom.

D) bond energy of O₂​ (498 KJ/mol) is higher than that of Cl₂​ (243 KJ/mol) because of double and single bond character of O₂​ and Cl​₂ respectively.

Correct pair will be (C) F₂​ and I₂​.