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(D) $1$. In $F-F$ vs $Cl-Cl$: Due to the small size of $F$ atoms,there is significant inter-electronic repulsion between the lone pairs,making the $F-

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(D) $1$. In $F-F$ vs $Cl-Cl$: Due to the small size of $F$ atoms,there is significant inter-electronic repulsion between the lone pairs,making the $F-F$ bond longer and weaker than expected,but compared to $Cl-Cl$,$F-F$ has a shorter bond length. This option does not satisfy the condition.$2$. In $C-C$ vs $Si-Si$: $C-C$ has a smaller atomic radius than $Si-Si$,so $C-C$ has a shorter bond length and higher bond energy. This does not satisfy the condition.$3$. In $P-P$ vs $N-N$: $N-N$ has a very small bond length due to the small size of $N$ atoms,but it has a very low bond energy due to strong lone pair-lone pair repulsions. $P-P$ has a larger bond length and higher bond energy than $N-N$. Thus,the $I^{st}$ species $(P-P)$ has a larger bond length and higher bond energy than the $II^{nd}$ species $(N-N)$.$4$. Upon re-evaluating the question criteria: The question asks for $I < II$ for both bond length and bond energy. None of the provided options satisfy this condition correctly based on standard chemical trends.

In which of the following pairs of species is the bond length as well as the bond energy of the $I^{st}$ species less than the $II^{nd}$ species?

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