c
\(\text { A) Molecules } \text { Bond energy. }(\text { KJ/mol) }\)

\(\text { O=O }\quad\quad\quad\quad\quad\quad 498\)

\(H - H \quad\quad\quad\quad\quad\quad 436\)

\(H - H\) bond energy is very high, comparable to the bond dissociation energy of \(O _2\), because \(H - H\) bond is formed by is orbital of \(H\) atoms.

\((B)\text { Molecules } \text { Bond energy. }( KJ / mol )\)

\(N \equiv N \quad\quad\quad\quad\quad\quad 945\)

\(\overline{ C } \equiv \stackrel{+}{ O } \quad\quad\quad\quad\quad\quad1072\)

\(N \equiv N\) 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. \(( KJ / mol )\)

\(F - F \quad\quad\quad\quad\quad\quad 156\)

\(I - I \quad\quad\quad\quad\quad\quad 151\)

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 \(O _2(498\, KJ / mol )\) is higher than that of \(Cl _2(243 \,KJ / mol )\) because of double and single bond character of \(O _2\) and \(Cl _2\) respectively. Correct pair will be \((C)\) \(F _2\) and \(I _2\).